Czechoslovakia is correct. All others had been concered by Hitler and Nazi Germany.
The American Civil War was a totally seperate issue to the Mexican War. Thats like equating the American War of Independence and saying that it was a direct cause for Vietnam.
Answer: B. It was strongly opposed by a group of Southern Democrats.
The development of the mayflower compact(first official document that mentions communal governing), the failure of Britain to maintain salutary neglect, the taxation without representation imposed on America by Britain, and Benjamin franklin who spoke of the unification of the New England colonies.