20 million emigrants from Europe came to U.S (1870-1910). In 1904-1914 the Panama Canal was built and it increased the influence in the Central America.

The U.S.A entered the World War 2 in 1917. After the war the U.S.A was the richest country and the past-war period was "The Period of increasing prosperity". But the crash on Wall Street in 1919 was the begining of a deep world-wide crises.

The U.S.A entered the second world war in December 1941 after the Japanese attack on Pearl Harbour. During the war the U.S.A played a leading role in the Tar East, Italy, Normandy. The characteristic feature of the period after the war was the cold war between the U.S.A and the U.S.S.R. In 1953 american troops fought in the Corean war. J. Kennedy solved sucessfuly the Cuba crises. In 1963 J. Kennedy was assassinated. During Kennedy´s and Johnson´s period the U.S.A was more deeply involved in the war in Vietnam. The war was ended 1973 the peace treaty was signed vy Richard Nixon, who was reelected in 1972. In 1974 he was forced to resign of the Watergate affair. Next president Gerald Ford signed Salt I. between the U.S.A and the U.S.S.R. In 1980 the U.S. president Ronald Reagan with the U.S.S.R. president Gorbatchow started the well known summits. The first important summit was in 1985 in Reykjawiik.

Geography:

The U.S.A is composed of 50 states joined in a federal republic. It is bordered on the north by Canada and on the south-west by Mexico. Alaska is separated from the continental U.S.A by Canada. Hawaii is situated halfaway between America and the Asian continent. The seat of the Federal Government is Washington D.C. The U.S.A is 9.5 million square km. Each state is theoretically sovereign having its own constitution and government and its name after the name of each town, village.

Relief of the country:

It consists of eastern Appalachian Highlands, interior planes-prairies and western Rocky Mountains. The highest point is Mount Mitchel (over 2000 m). Interior plains include Central Lowlands including the Great Lake and the Great Plain. Western Highlands are covering 1/3 of the country. The highes peak is Mt. Whitney (4400 m).

Rivers and Lakes:

Rivers entering the Atlantic - they are short, not very deep and not very important for economy. These are like Hudson, Potomac, Delaware, Sasquahana. Hudson is only navigable river. The main river entering into Mexico Gulf is Mississippi.