They check there answers using history, like they use primary sources etc.
Answer:
Assuming that this is referring to the same list of options that was posted before with this question, the best answer is that tighter immigration laws were passed, because the nativists thought that immigrants were stealing jobs.
Explanation:
Answer:
The answer to this question is B. This resulted in a rise in socialist and anarchist movements.
Explanation:
Wdym? What is ur question?