Gutenberg's press and the subsequent printing and sharing of philosophical essays about the role of the Church allowed for the Reformation to spread and take root.
Prior to the printing press, a person would have to hand copy a text. The printing press made it so hundreds of copies of texts could be printed quietly and shared widely allowing people to interact with new ideas.
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The answer to your question is C Boston
The war. This is because During the war, more than 12 million Americans were sent into the military, and a similar number toiled in defense-related jobs. Those war jobs seemingly took care of the 17 million unemployed in 1939. Most historians have therefore cited the massive spending during wartime as the event that ended the Great Depression. Hope this helps! Please mark brainlist.