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U.S. fleet forces Japan out of self imposed isolation / embargo
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U.S. declares war on Japan
http://www.history.com/this-day-in-history/the-united-states-declares-war-on-japan
After the attacks on Pearl Harbor the U.S. officially joins WWII and declares war on Japan -
Pearl Harbor is bombed by Japanese air fleet
http://www.history.com/topics/world-war-ii/pearl-harbor
Pearl Harbor was bombed as an act of war by japan bringing the U.S. into WWII -
The first U.S. Naval bombardment of Japanese home islands
http://www.historyplace.com/unitedstates/pacificwar/timeline.htm
The U.S begin a battle on Japan mainland towards the end of WWII -
Hiroshima is nuked by U.S in one of the final attempts t end WWII
https://en.wikipedia.org/wiki/Atomic_bombings_of_Hiroshima_and_Nagasaki
Nuclear weapons were used to try and end WWII, but more measures had to be taken -
Nagasaki is nuked by U.S. to end WWII
https://en.wikipedia.org/wiki/Atomic_bombings_of_Hiroshima_and_Nagasaki
This was the last attempt to end WWII, and it worked -
Japan becomes an independent state on April 28, 1952 and also become allies with U.S.
U.S. help Jan rebuild its country and therefor became allies.