Formation of the United States of America

The Thirteen Colonies began a rebellion against British rule in 1775 and proclaimed their independence in 1776 as the United States of America. The United States defeated Britain with help from France especially, and also the United Provinces and indirectly from Spain in the American Revolutionary War. The colonists' 1777 capture of the British invasion army at Saratoga secured the Northeast and led the French into an open alliance with the United States.

In 1781, Washington led a combined American and French army, acting with the support of a French fleet, and captured a large British army led by General Cornwallis at Yorktown, Virginia, thus virtually ending the land war. Political scientist Seymour Martin Lipset observes, "The United States was the first major colony successfully to revolt against colonial rule. In this sense, it was the first 'new nation'.

On July 4, 1776, the Second Continental Congress, still meeting in Philadelphia, declared the independence of "the United States of America" in the Declaration of Independence. July 4 is celebrated as the nation's birthday. The new nation was founded on Enlightenment ideals of liberalism in what Thomas Jefferson called the unalienable rights to "life, liberty and the pursuit of happiness," and dedicated to republican principles. Republicanism emphasized the people are sovereign (not hereditary kings), demanded civic duty, feared corruption, and opposed aristocracy. The new nation was governed by Congress, and until 1789 followed the Articles of Confederation of 1777.

After the war finally ended in 1783, there was a period of prosperity.[citation needed] The national government was able to settle the issue of the western territories, which were ceded by the states to Congress and became territories (and after 1791 started to become states). Nationalists worried that the new nation was too fragile to withstand an international war, or even internal revolts such as the Shays' Rebellion of 1786 in Massachusetts. Nationalists—most of them war veterans—organized in every state and convinced Congress to call the Philadelphia Convention in 1787. The delegates from every state wrote a new Constitution that created a much more powerful and efficient central government, one with a strong president, and powers of taxation. The new government reflected the prevailing republican ideals of guarantees of individual liberty and upon constraining the power of government through a system of separation of powers.

To assuage the Anti-Federalists who feared a too-powerful national government, the nation adopted the United States Bill of Rights in 1791. Comprising the first ten amendments of the Constitution, it guaranteed individual liberties such as freedom of speech and religious practice, jury trials, and stated that citizens and states had reserved rights (which were not specified).