Answer:
Correct answer is penicillin
The most significant contributing factor to the Steel Strike of 1919 in the US was the end of World War I, which left many of those workers who had unionized in federal unions with less opportunities for work then prior and during the war.
The 1860 presidential election
states’ rights
The answer you are actually looking for is new immigrants often did not speak English!
I am sure this is the correct answer!
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