But with the economic increase of the colonies, British parilament (where colonies had no actual representation) started to exploit the colonies by several acts, which remarkably influenced trade and life. Tough stand of English government forced colonists to make revolution.

The struggle for independence had been started by 2 important events-by Boston massacre,when british redcoats fired into the crowd of glumblers and the Boston tea party on 16th december 1773, when 10000 pounds worth of tea was dumped into the sea by citizens dressed up as an indians. During the war for independence British had a big army in America and moreover they cooperated with many of indian tribes. Overagainst the Americans, led by great strategist george Washington were supported by some of the european powers (rivals of England). Finally,after the battle of Yorktown in 1781 they forced British to surrender. On July 1776 was signed Declaration of Independence written by Thomas Jefferson, which officially denied colonial obligation to England. Concession of the British land had been granted by treaty of paris 1783, constitution was ratified in 1788, 1st president was George Washington. Variances between industrial North and agricultural South leaded to American civil war in the years 1861-1865. In 1863 president Lincoln issued Emancipation Proclamation-slaves became free, but remained separated from whites. In the second half of 19th century the imigration from Europe had dramatically increased, what provoked the anticatholic and antijewish feelings. During The 1st world war America stood as a neutral country, but when German submarines sank several American ships, it wasn´t longer possible to stay by side. On April 1917 America declared war on the central powers and helped Allies to win the war. The president Wilson designed 14 points determined for negotiations in Paris. In the 20’s the America was enjoying of the economic increase, which ended in 1929 by the worldwide crisis.

In the 2nd world war the United States joined Allies once again after the ambush of Pearl Harbour. By the end of the war the US helped to recover the whole western Europe.

The cold war against Soviet Union began because it posed a possible threat to the US by its possession of the atomic bomb and by dominating of Eastern Europe. The biggest danger of nuclear war was in 1962 when Soviet Union installed nuclear weapons on Cuba. President Kennedy responsed with a naval blockade. Finally Chruscev agreed to send the missiles back in exchange for the American promise never to attack Cuba.
Kennedy was assassinated in Dallas 1963.