The main causes of the first world war were:
<h3>Militarism</h3>
There was a growth of millenarianism in nations. many nations had sophisticate weapons and well trained military.
<h3>Alliances</h3>
The alliances that were formed between nations was part of the war. There were the axis and the allied powers.
<h3>Nationalism</h3>
The increase in nationalism and the need to protect country and property was a part of the war.
<h3>Imperialism</h3>
Some nations has powers over other countries. They controlled the affairs and the resources in these areas.
<h3>Death </h3>
The killing of Franz Ferdinand was partly the reason why the war started.
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The correct answer to this open question is the following.
The reason for the United States of America's departure from Vietnam in 1973 was that President's Nixon administration was already under heavy scrutiny and criticism for maintaining the United States troops installed in South Vietnam.
After very difficult moments such as teh Tet Offensive, the American society in general, and the young Americans in particular, started to seriously question the participation of the United States Army in the Vietnam War, concluding that was not a US war. They started to demand the withdrawal of the US troops from Vietnam and organized many protests and marches to demand action on the part of the federal government.
Finally, in January 1973, a peace agreement was signed and the US started to withdraw its troops. The process lasted until March 29, 1973.
However, the United States contib¿nued to support
South Vietnam, applying the foreign policy of containment to impede the spread of Communist over South Vietnam.
They had to face slavery, and whites had the authorities that colored people didn't.
