The belief that American settlers should start spreading westward and settling those lands.
Answer:
B: Unrestricted submarine welfare
Explanation:
I believe the answer is "C. tried to force people to improve their morals."
Hoover called prohibition the "Noble Experiment" because the goals (keeping families together, eliminating alcohol abuse) were deemed "noble". While these goals were never met, the nickname caught on.
When Lenin came up with the idea for the New Economic Policy, he made some exceptions to allow for certain amounts of capitalism to be implemented to boost output of war materials.
it affected the world because it was a disaster