American History up to 1877

1.What made Native American peoples vulnerable to conquest by European adventurers?
2.Why was the U.S. Constitution a controversial document even as it was being written?
3.Why did women's issues suddenly become so prominent in American culture?
4.How did plantation crops and the slavery system change between 1800 and 1860? Why did these changes occur?

Please answer each question using 3-5 paragraphs each. Cite your sources in MLA format.