C. each state had its own form of government
Hey, There! I believe the correct answer for this would be "B. a drastic decline in the American Indian population" during the westward expansion a number of american Indians were pushed of their land and violently oppressed. Many died from diseases and battles to protect their land, but mainly from disease.
D, the Bill of Rights that Madison wrote would be added to the Constitution as amendments once the Anti-Federalists supported ratification. Anti-Federalists were worried that the Constitution gave too much power to the federal government. Furthermore, they were worried a strong central government could lead to tyranny. The Bill of Rights made the Anti-Federalists feel better. They were glad that there were rights for the average citizen that couldn't be taken away, because they thought these rights could prevent tyranny.
It would be industrialization that changed American culture drastically. This is also related to westward expansion, and in many ways led to the conflicts that brought about Civil War.
It can't be a, or b, so it's only c or d. For me i'd say D) The country.
