Vermont is a state in the New England region of the northeastern United States of America. The state ranks 45th by total area, and 43rd by land area at 9,250 square miles, and has a population of 608,827, making it the second least populous state (second only to Wyoming). The only New England state with no coastline along the Atlantic Ocean, Vermont is notable for the Green Mountains in the west and Lake Champlain in the northwest. It is bordered by Massachusetts to the south, New Hampshire to the east, New York to the west, and the Canadian province of Quebec to the north.

Originally inhabited by Native American tribes (Abenaki, and Iroquois), the territory that is now Vermont was claimed by France but became a British possession after France's defeat in the French and Indian War. For many years, control of the area was disputed by the surrounding colonies, notably between New Hampshire and New York. Settlers who held land titles granted by these colonies were opposed by the Green Mountain Boys militia, which eventually prevailed in creating an independent state. Vermont became the 14th state to join the United States, following a 14-year period during and after the Revolutionary War as the independent Republic of Vermont.

It is the leading producer of maple syrup in the United States. The state capital is Montpelier, and the largest city is Burlington.

The first European to see Vermont is thought to have been Jacques Cartier, in 1535. On July 30, 1609, French explorer Samuel de Champlain claimed the area of what is now Lake Champlain, giving to the mountains the appellation of les Vert Monts (the Green Mountains). France claimed Vermont as part of New France, and erected Fort Sainte Anne on Isle La Motte in 1666 as part of the fortification of Lake Champlain. This was the first European settlement in Vermont and the site of the first Roman Catholic Mass.

During the latter half of the 17th century, non-French settlers began to explore Vermont and its surrounding area. In 1690, a group of Dutch-British settlers from Albany under Captain Jacobus de Warm established the De Warm Stockade at Chimney Point (eight miles or 13 km west of present-day Addison). This settlement and trading post was directly across Lake Champlain from Crown Point, New York (Pointe à la Chevelure).

The first permanent British settlement was established in 1724, with the construction of Fort Dummer in Vermont's far southeast under the command of Lieutenant Timothy Dwight. This fort protected the nearby settlements of Dummerston and Brattleboro. These settlements were made by the Province of Massachusetts Bay to protect its settlers on the western border along the Connecticut River. The second British settlement was the 1761 founding of Bennington in the southwest.

In 1731, more French settlers arrived. They constructed a small temporary wooden stockade (Fort de Pieux) on what was Chimney Point until work on Fort St. Frédéric began in 1734. The fort, when completed, gave the French control of the New France / Vermont border region in the Lake Champlain Valley and was the only permanent fort in the area until the building of Fort Carillon more than 20 years later. The government encouraged French colonization, leading to the development of small French settlements in the valley. During the Seven Years War, locally known as the French and Indian War, some Vermont settlers, including Ethan Allen, joined the colonial militia assisting the British in attacks on the French. The British attempted to take the Fort St. Frédéric four times between 1755 and 1758; in 1759, a combined force of 12,000 British regular and provincial troops under Sir Jeffrey Amherst captured the fort. The French were driven out of the area and retreated to other forts along the Richelieu River. One year later a group of Mohawks burnt the settlement to the ground, leaving only chimneys, which gave the area its name.

Fort Carillon on the New York-Vermont border, another French fort constructed in 1755, was the site of two British offensives under Lord Amherst's command: the unsuccessful British attack in 1758 and the retaking of the following year with no major resistance (most of the garrison had been removed to defend Quebec, Montreal, and the western forts). The British renamed the fort Fort Ticonderoga (which became the site of two later battles during the American Revolutionary War). Following France's loss in the French and Indian War, the 1763 Treaty of Paris gave control of the land to the British.

The end of the war brought new settlers to Vermont. A fort at Crown Point had been built, and the Crown Point Military Road stretched from the east to the west of the Vermont wilderness from Springfield to Chimney Point, making travel from the neighboring British colonies easier. Three colonies laid claim to the area. The Province of Massachusetts Bay claimed the land on the basis of the 1629 charter of the Massachusetts Bay Colony. The Province of New York claimed Vermont based on the early Dutch Charter to the West India Company for lands west of the Connecticut River, and the identical land granted to the Duke of York (later King James II) in 1664. The Province of New Hampshire also claimed Vermont based upon a decree of George II in 1740. In 1741, George II ruled that Massachusetts's claims in Vermont and New Hampshire were invalid and fixed Massachusetts's northern boundary at its present location. This still left New Hampshire and New York with conflicting claims to the land.

The situation resulted in the New Hampshire Grants, a series of 135 land grants made between 1749 and 1764 by New Hampshire's colonial governor, Benning Wentworth. The grants sparked a dispute with the New York governor, who began granting charters of his own for New Yorker settlement in Vermont. In 1770, Ethan Allen—along with his brothers Ira and Levi, as well as Seth Warner—recruited an informal militia, the Green Mountain Boys, to protect the interests of the original New Hampshire settlers against the new migrants from New York. When a New York judge arrived in Westminster with New York settlers in March 1775, violence broke out as angry citizens took over the courthouse and called a sheriff's posse. This resulted in the deaths of Daniel Houghton and William French in the "Westminster Massacre."

On January 18, 1777, representatives of the New Hampshire Grants convened in Westminster and declared the independence of the Vermont Republic. For the first six months of the republic's existence, the republic was called New Connecticut.

On June 2, a second convention of 72 delegates met at Westminster, known as the "Westminster Convention." At this meeting, the delegates adopted the name "Vermont" on the suggestion of Dr. Thomas Young of Philadelphia, a supporter of the delegates who wrote a letter advising them on how to achieve admission into the newly independent United States as the 14th state. The delegates set the time for a meeting one month later. On July 4, the Constitution of the Vermont Republic was drafted during a violent thunderstorm at the Windsor Tavern owned by Elijah West and was adopted by the delegates on July 8 after four days of debate. This was among the first written constitutions in North America and was indisputably the first to abolish the institution of slavery, provide for universal manhood suffrage and require support of public schools. The Windsor tavern has been preserved as the Old Constitution House, administered as a state historic site.

The Battle of Bennington, fought on August 16, 1777, was a seminal event in the history of the state of Vermont. The nascent republican government, created after years of political turmoil, faced challenges from New York, New Hampshire, Great Britain and the new United States, none of which recognized its sovereignty. The republic's ability to defeat a powerful military invader gave it a legitimacy among its scattered frontier society that would sustain it through fourteen years of fragile independence before it finally achieved statehood as the 14th state in the union in 1791.

During the summer of 1777, the invading British army of General John Burgoyne slashed southward from Canada to the Hudson River, captured the strategic stronghold of Fort Ticonderoga, and drove the Continental Army into a desperate southward retreat. Raiding parties of British soldiers and native warriors freely attacked, pillaged and burned the frontier communities of the Champlain Valley and threatened all settlements to the south. The Vermont frontier collapsed in the face of the British invasion. The New Hampshire legislature, fearing an invasion from the east, mobilized the state's militia under the command of General John Stark.

General Burgoyne received intelligence that large stores of horses, food and munitions were kept at Bennington, which was the largest community in the land grant area. He dispatched 2,600 men, nearly a third of his army, to seize the colonial storehouse there, unaware that General Stark's New Hampshire troops were then traversing the Green Mountains to join up at Bennington with the Vermont continental regiments commanded by Colonel Seth Warner, together with the local Vermont and western Massachusetts militia. The combined American forces, under Stark's command, attacked the British column at Hoosick, New York, just across the border from Bennington. General Stark reportedly challenged his men to fight to the death, telling them that: "These are your enemies. They are ours, or this night Molly Stark sleeps a widow!" In a desperate, all-day battle fought in intense summer heat, the army of yankee farmers killed or captured virtually the entire British detachment. General Burgoyne never recovered from this loss and eventually surrendered the remainder of his 6,000-man force at Saratoga, New York, on October 17.

The Battles of Bennington and Saratoga are recognized as the turning point in the Revolutionary War because they were the first major defeat of a British army and convinced the French that the Americans were worthy of military aid. Stark became widely known as the "Hero of Bennington," and the anniversary of the battle is still celebrated in Vermont as a legal holiday known as "Bennington Battle Day." Under the portico of the Vermont Statehouse, next to an heroic granite statue of Ethan Allen, there is a brass cannon that was captured from the British troops at the Battle of Bennington.

Vermont continued to govern itself as a sovereign entity based in the eastern town of Windsor for fourteen years. The Vermont Republic issued its own currency, coins and operated a statewide postal service. Thomas Chittenden, who came to Vermont from Connecticut in 1774, acted as head of state, using the term governor over president. Chittenden governed the nascent republic from 1778 to 1789 and from 1790 to 1791. Chittenden exchanged ambassadors with France, the Netherlands, and the American government then at Philadelphia. In 1791, Vermont joined the federal Union as the fourteenth state–the first state to enter the union after the original thirteen colonies, and a counterweight to slave holding Kentucky, which was admitted to the Union shortly afterward.

In 1854 Vermont Senate report on slavery echoed the Vermont Constitution's first article, on the rights of all men, questioning how a government could favor the rights of one people over another. The report fueled growth of the abolition movement in the state, and in response, a resolution from the Georgia General Assembly authorizing the towing of Vermont out to sea. The mid to late 1850s saw a transition from Vermonters mostly favoring slavery's containment, to a far more serious opposition to the institution, producing the Radical Republican and abolitionist Thaddeus Stevens. As the Whig party shriveled, and the Republican Party emerged, Vermont strongly trended in support of its candidates, first on the state level and later for the presidency. In 1860 it voted for President Lincoln, giving him the largest margin of victory of any state. This strong lean toward the Republican Party has continued until very recently as evidenced by only electing 2 senators from other parties since the civil war (Patrick Leahy from the Democratic Party and Bernard Sanders, an independent).

During the American Civil War, Vermont sent more than 34,000 men into United States service, contributing 18 regiments of infantry and cavalry, 3 batteries of light artillery, 3 companies of sharpshooters, 2 companies of frontier cavalry, and thousands in the regular army and navy, and in other states’ units. Almost 5,200 Vermonters, 15%, were killed or mortally wounded in action or died of disease. Vermonters, if not Vermont units, participated in every major battle of the war. Among the most famous of the Vermont units were the 1st Vermont Brigade, the 2nd Vermont Brigade, and the 1st Vermont Cavalry. A large proportion of Vermont’s state and national-level politicians for several decades after the Civil War were veterans.

The two decades following the end of the American Civil War (1864-1885) saw both economic expansion and contraction, and fairly dramatic social change. Vermont's system of railroads expanded and were linked to national systems, agricultural output and export soared and incomes increased. But Vermont also felt the effects of recessions and financial panics, particularly the 1873 Panic which resulted in a substantial exodus of young Vermonters. The transition in thinking about the rights of citizens, first brought to a head by the 1854 Vermont Senate report on slavery, and later Lincoln's Gettysburg Address in changing how citizens perceived civil rights, fueled agitation for women's suffrage. The first election in which women were allowed to vote was on December 18, 1880, when women were granted limited suffrage and were first allowed to vote in town elections, and then in state legislative races.

Large-scale flooding occurred in early November 1927. During this incident, 85 people died, 84 of them in Vermont. Another flood occurred in 1973, when the flood caused the death of two people and millions of dollars in property damage.

On April 25, 2000, as a result of the Vermont Supreme Court's decision in Baker v. Vermont, the Vermont General Assembly passed and Governor Howard Dean signed into law H.0847, which provided the state sanctioned benefits of marriage to gay and lesbian couples in the form of civil unions. Controversy over the civil unions bill was a central issue in the subsequent 2000 elections.