Which of these is one reason that American workers generally favored immigration restriction? Immigrants tended to be anti-union. Immigrants were often willing to work for lower pay. Immigrants were associated with anarchism and communism. Immigrants did not fit in because they could not speak English.
"Immigrants were often willing to work for lower pay" would be the best option from the list, since many Americans felt that this made it harder for them to find jobs since employers were more willing to hire the immigrants.
Immigrants were willing to work for lower pay should be the answer because as American workers started to go on strike business owners quickly replaced them with immigrants who were willing to take workers low pay and long hours.
