Answer:
I think it is Separation of powers.
Explanation:
The U.S Constitution is separation of powers and it divides the government. Popular sovereignty is based off, the will of the people. Democratic people have the rights just like in sovereignty.
Answer:
4.Cuna de la cultura Y Universal
Explanation:
Slavery was fought over because president Abraham Lincoln wanted to unite the Union and Confederacy.
The railroad companies contributed to the development of the West by selling low-cost parcels of their western land for farming. Settlers, lured by the Homestead Act of 1862, traveled west on the trains to farm the fertile soil.
Credit to the internet.