Compromise of 1876. Basically a corrupt bargain in the House of Representatives where Republicans agreed to remove federal troops from the (solidly Democratic) South in exchange for the presidency.
I would imagine it was because reconstruction of the South was over after the Civil War
After the withdrawal of US troops in South Vietnam, the North and the South were joined to form a single communist nation under the rule of Ho Chi Min. And soon after the massacre in Cambodia by Pol Pot.
The Railroad Strike.
Vietnamization
About 37 thousand.
Cambodia
I do't now
The last Federal troops (about 3000 out of a total US Army of 27,000) were withdrawn from the South in 1877 by Rutherford B Hayes.
Reconstruction; in 1877, the US began removing Federal troops/administrators from the former Confederacy.
Rutherford B. Hayes did that soon after he took office in 1877.
After the withdrawal of US troops in South Vietnam, the North and the South were joined to form a single communist nation under the rule of Ho Chi Min. And soon after the massacre in Cambodia by Pol Pot.
The Railroad Strike.
The city on the coast of south Vietnam where the first US troops landed was Da Nang.
During the Korean war the North Korean troops took over almost the whole Korean peninsula. Only due the US led UN troops intervention did the South Korean survive. After Some back and forth fighting with the US + South Korean troops agains North Korean + Chinese troops did the border stabilize where it stands today. US troops remain in South Korea as a deterrant against Norths invasion and to uphold the peace in the peninsula.
Vietnamization
westmoreland
28,000
About 37 thousand.