The event that got the USA seriously involved with WW2 was the attack on Pearl Harbor on December 7, 1941.
The state the battle of Gettysburg took place was Pennsylvania
It was the "Meiji Restoration" that launched a period of rapid industrialization and Westernization in Japan during the 19th century, since this brought back traditional Japanese rule and led to modernization.
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The Great Migration was the movement of some six million African Americans from rural areas of the Southern states of the United States to urban areas in the Northern states between 1916 and 1970.
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