On April 14th Lincoln was assassinated by an agent of the South.

FROM THE CIVIL WAR TO THE END OF THE 19TH CENT., 1865-1900
In the next period there was a big economic growth, which led U.S. to be the most powerful nation in the world. 12 years after the Civil War were followed by the period of Reconstruction. Urbanization was the major trend, especially in the north. Then the South was occupied by northern troops, the democracy grew. The blacks were given the right to vote and many were elected to the Congress.
In 1866 the defeated southern planers found the Ku-klux-klan against black people. In 1867 U.S. bought Alaska from Russia. Between 1870 and 1910 there were 20 mio. immigrants in the U.S. Hawaii became a U.S. state in 1894.

to study:
Forming A National Government
The Bill Of Rights
War With Mexico
Technology And Transformation - in the period which followed, the war damage in the South was slowly repaired and industrialization began. The West was open for mining, cattle ranching and grain production. The building of railways across the continent started, and new settlements were established. The prosperity of the country rapidly increased. There were new immigrants from European countries coming to the U.S.A. (A Nation Of Immigrants)
The first American military mobilization on foreign soil was not until 1917 when the U.S. entered World War I. against Germany and helped France and England. U.S. president Woodrow Wilson helped negotiate a peace treaty in 1918.
The ‘Roaring Twenties’ brought large economic growth until The Great Depression started after the stock market crash in 1929. In the next decade unemployment was high and poverty widespread. The Depression lasted till the beginning of the World War II. The U.S.A. remained neutral and did not enter the War till the Japanese attacked on Pearl Harbour. The war was declared against Japan in 1941 and president Harry Truman ordered the atomic bomb dropped on Hiroshima and Nagasaki. The Cold War period after WWII saw increasing mistrust between the U.S. and the Soviet Union. There were several war conflicts e.g. Korean War. The post war period was a time of economic expansion. The U.S. continued as a world leader in scientific, medical and technological achievements. The Soviet Union was the first to put a man in space, the U.S. had the first man to walk on the Moon (Neil Armstrong, 1969)
The 60s saw tremendous social change and unrest. American blacks demanded an end to racial discrimination through The Civil Rights Movement - civil rights leader Martin Luther King was assassinated in 1968. The assassinations of president John F.