yes it was used and it was very important.
yes
Japan .
15 years.
All of it. US military installations were set up in former Japanese military sites; as well as strategic regions, such as seaports, etc. Japan was used as a "cold war" base...for fighting communist expansion (Korean War and Vietnam War).
Currently the United States & Japan have a very good relationship at several different levels: militarily, diplomatically, economically, culturally & socially. The Surrender of Japan at the end of the Second World War ushered in vast improvements in Japanese society and lessoning of international tension between Japan and other Asian & Pacific nations. The United States assisted Japan's post-war recovery & Japan worked hard to rebuild trust with her former enemies.
yes
Japan .
to rebuild and maintain order
Douglas MacArthur .
To rebuild their country and become a stronger country
The United States proper was not damaged or seriously affected by the First or Second World Wars. America helped to rebuild Europe, Japan & the Philippines after the Second World War.
15 years.
It allowed Japan to rebuild, creating a democratic government and financial structure
Japan accepted the US's assistance to rebuild after World War I. Their economy prospered and grew and morphed into a huge technological success.
It allowed Japan to rebuild, creating a democratic government and financial structure similar to those in western societies. (A+)
None... Social Security (the government program) did not exist during WW1.
Approximately two billion dollars.