All thirteen colonies united in a Congress that called on the colonies to write new state constitutions. After armed conflict began in Massachusetts, Patriots drove the royal officials out of every colony and assembled in mass meetings and conventions. Those Patriot governments in the colonies then unanimously empowered their delegates to Congress to declare independence. In 1776, Congress created an independent nation, the United States of America. With large-scale military and financial support from France and military leadership by General George Washington, the American Patriots won the Revolutionary War. The peace treaty of 1783 gave the new nation the land east of the Mississippi River (except Florida and Canada). The central government established by the Articles of Confederation proved ineffectual at providing stability, as it had no authority to collect taxes and had no executive officer. Congress called a convention to meet secretly in Philadelphia in 1787 to revise the Articles of Confederation. It wrote a a new Constitution, which was adopted in 1789. In 1791, a Bill of Rights was added to guarantee inalienable rights. With Washington as the Union's first president and Alexander Hamilton his chief political and financial adviser, a strong central government was created. When Thomas Jefferson became president he purchased the Louisiana Territory from France, doubling the size of the US. A second and last war with Britain was fought in 1812.
All thirteen colonies united in a Congress that called on the colonies to write new state constitutions. After armed conflict began in Massachusetts, Patriots drove the royal officials out of every colony and assembled in mass meetings and conventions. Those Patriot governments in the colonies then unanimously empowered their delegates to Congress to declare independence. In 1776, Congress created an independent