the United states of America was created in 1776 with the signing of the Declaration of Independents. Throughout history, America has affected the world and the people in it. One example of this is them joining the allied side in WWI and WWII changing the outcome. Another more complicated example is how the American Revolution started the French Revolution and Napoleon's rise to power.
Picture of the Constitution
The continental United States have reached from the East coast to the West coast of North America. There are 50 states with 48 being in this picture.
Crash Course US History on the Constitution