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Jim Crow Laws
maybe thousands, except for the two used in WW2, all were tests.
It isn't happening.The only two bombs that have been used were the Nagasaki and Hiroshima bombs. Many others have been manafactured, but only two have been used other than in tests.
Musket balls.
Napalm?
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Warren G. Harding used the campaign slogan "Back to Normalcy" in the 1920 election and won.
true
To mimic the methods employed by other scientests.
Many scientists perform tests to see what type of heat or cold the human skin can tolerate. These tests are used for studies for various products.
Psychology creates and tests hypotheses like any other type of science.
statistical tests
statistical tests
Worldview
It is a legitimate word. If it did not exist before the Return to Normalcy, it was added to the English language afterward. Today, the word "normality" would probably be used instead. New words are created as needed, and old words become archaic.