The correct answer for 1 should be C. Capitalism, because it is based on having private property and owning your own company
The correct answer for 2 should be c. The U.S. avoided economic and political alliances because that's what isolationism in politics is about.
The main reason why most Americans rejected Marxism in the early 1900s is because the United States economy was doing quite well thanks to the Industrial Revolution--the core ideals of which went against the main ideals of Marxism.
Jamestown was important because it was the first successful English colony in North America.
Source and more information:
http://www.dailypress.com/news/dp-25282sy0may06-story.html
I hope this helps!
The correct answer is B. A religious group assassinates a politician for demanding more separation of church and state.
Explanation
Terrorism is a form of action of a specific group that is characterized by using violence and terror to cause remembrance in the population and make a specific demand. In general, terrorist actions use systematic violence to defend their ideologies and attack anyone who is considered to be a violator or opponent of it (it can be the government, a minority group, or another). According to the above, the correct answer is B. A religious group assassinates a politician for demanding more separation of church and state because it is a violent act in response to an action that goes against the ideology of the religious group.