Answer:
American Sailors were impressed by England, were forced to work for the Royal Navy.
I believe the answer is: motivations.
When you understand your motivations, you would most likely wouldn't stop unless your end goal is achieved because you feel a strong drive for a certain change. Because of this, the likelihood of you staying within your plan would also be increased.
Answer C, Serbs, thanks to the Serbian Revolution (1804 to 1815)
Answer:
Several factors contributed to the fall of the Western Roman Empire, including the socioeconomic and political instability of the empire, the Germanic invasion and the invasion of other so-called "barbarian" tribes, the rapid rise of the Eastern Roman Empire, and more.