What factors led immigrants to come to the united states in the 1880s?

Which of these resulted in an actual slow down or limiting of the u. s. and soviet nuclear arsenals?

How did industrial production improvements impact export-dependent areas of the world during the great depression?   a.  demand for certain raw materials rose.      b.  demand for certain raw materials fell.      c.  the new technology was exported to most raw material producing nations.      d.  there was a decrease in tariffs.

Why was the nationalist party more popular in china’s cities than in the countryside?