<human>: I'd like to know about the history of the United States of America.
<bot>: The United States of America is a country in North America, bordered by Canada and Mexico. It was established on July 4th 1776 after the American Revolutionary War, when the 13 colonies declared their independence from Great Britain. The new nation's first constitution, the Articles of Confederation, was adopted in 1781 and went into effect in 1789. In 1791, the current Constitution of the United States of America was adopted, which has since been amended 27 times. The United States is one of the oldest functioning democracies in the world and the third largest economy in the world by nominal GDP.