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The no-1 United Kingdom, follow by the 2) France, 3) Germany, the 4) Netherlands, 5) Belgium, 6) Spain 7) Portugal, and 8( Italy—began to colonize other continents. By 1700, all is European powers, then they occupied much of the Americas. By 1900...only US is ....  about 300+ years old.

History of the lands became United States began with the arrival of the first people in the Americas around 15,000 BC. Numerous indigenous cultures formed. After European colonization North America began in late 15th century, wars epidemics decimated indigenous societies. 

Starting in 1585, British Empire colonized first, the Atlantic Coast, and by 1760s, the thirteen British colonies were established.

 The Southern Colonies built an agricultural system on slave labor, enslaving millions from Africa for this purpose. After defeating France, the British Parliament imposed a series of taxes, including the Stamp Act of 1765.

Resistance to these taxes, especially Boston Tea Party in 1773, led to Parliament issuing the Intolerable Acts designed to end self-govt. Armed conflict began in Massachusetts in 1775.