What did the immigration of the late 1800s/1900s have a positive impact on the u. s?

What did the us civil rights movement gain new momentum after world 2

Why was the united states motivated to establish the open door policy? a. the policy guaranteed american commerce with china. b. the policy supported the chinese nationalist cause. c. the policy led to a gain of american colonies in asia. d. the policy claimed damages from the chinese.

Explain what the following quote means: “if men are naturally in a state of war, why do they always carry arms and why do they have keys to lock their doors? ”