2. what event stopped most international movement immigrants coming to the us ?
4. what two groups did rural protestants not trust?
9. what world leader used the pseudo-science of eugenics for his master plan of creating the perfect human race ? (world war 11, 1930s and 40s)

Protestants and catholics did not trust each other. Congress started banning most immigrants to come to the US. And, most did not want to enter because of the harsh discrimination especially to chinese immigrants. Most couldn't even enter once they arrived on ship they were sent to another land and they declined.  Ernst Rüdin used eugenics as a justification for the racial policies of Nazi Germany. Adolf Hitler followed soon after

Explanation:

Adolf hitler thought there should only be one race and that was blue eyes and white. If you were jewish you were not human and needed to be removed and sent to concentration camps.