Answer:
On July 4, 1776, the Congress issued the Declaration of Independence, which for the first time asserted the colonies' intention to be fully independent of the mother country. The Congress established itself as the central governing authority under the Articles of Confederation, which remained in force until 1788.
C. Would be the correct answer.
The main objective of the National Origins Act of 1924 was to favor the immigration from Northern and Western Europe. The government did this to tighten the 1921 quota formula for immigration.
Stronger rails allowed heavier goods to be shipped from one point to another. Larger trains allowed more load to be moved thus allowing an increase in what "people could be moved" If you have any other questions feel free to ask!