Well in the time frame of 1820 to about 1850 the Chinese immigrants had to come across the railroad. But also some of the immigrants did help build the conventional railroad for others so travel across :) I hoped that this helped with your question :)
Answer:
I would say C. It took away Native Americans' source of economic power.
Explanation:
It's either B or C, but the Europeans took away the culture that the Natives had and the economic stability. The natives had there own roads, irrigation systems, and towns, and the Europeans came in with all new tools and weapons.
D. The Five Tribes had sided with the Confederacy during the Civil War and had to cede lands i'm pretty sure.
the answer is gross national income
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3; after the Gulf of Tonkin Resolution was passed in the Vietnam War, which basically gave the president a "blank check," Congress needed to reassert its constitutional rights pertaining to war.