US Involvement in Japan
Pearl Harbor
The United States naval base, Pearl Harbor was bombed by the Japanese. This started the war between the United States and Japan.
Atomic Bomb
The United States dropped atomic bombs on Hiroshima and Nagasaki, which caused devastation and many causalities. This was the end of World War II after people saw how much damage nuclear weapons could cause.
Post-War
Japan had a large overall change after the war. There was democratic, educational, and economic reform and eventually demilitarization. The Treaty of Sanfransico allowed Japan to take their control back in 1952 and now the US and Japan have a close relationship.
Cooperation
The Japanese government has invited 47,000 military servicemen from the US. The US helped Japan when they became involved in the Cold War. Now Japan has a very strong economy.
http://usforeignpolicy.about.com/od/countryprofile1/p/usjapan.htm
http://3.bp.blogspot.com/-Z4GxEOLqBh8/UMIelJwiLCI/AAAAAAACE_I/tNde7Nx3zoo/s640/Awesome+Color+Photos+of+the+Attack+on+Pearl+Harbor+(6).jpg
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjc1C4OO0r6EX6HjQ_X90sfT5JSUT7h6EnYVlkzAybJFcx-xBWwsphgjDfIX393oARA4K18eVvEGGNLbjORcULYP3DSPqhK1UmXOyK3lY4Fa6-QLqPMTsFGb2qTKCPUIlEuNuyJ2BOV9Bvo/s1600/Hiroshima.jpg
http://s3.amazonaws.com/static.history.state.gov/milestones/japan.jpg
https://busienomics.files.wordpress.com/2012/02/japan_economy.jpg
http://www.teara.govt.nz/files/34280-pc.jpg