Why did some americans oppose immigration?

1: how did the rise of rulers with total power in europe and asia lead to world war 2?

Which of the following was a difficulty faced by the ottoman empire in the 1700s and 1800s?   a.  financial independence      b.  lack of trained artisans      c.  refusal to trade with other nations      d.  rebelling ethnic groups

Why hadn’t europeans used maritime routes before the age of exploration?