Which was the result of barbarian invasions of the western roman empire?

Need on these last 2 questions on my social studies homework 5 and 6 then i’m done with the homework

The articles of confederation did not allow the government the power to tax or to force the states to do anything. what challenges could this cause

What was the major impact of plessy v. ferguson upon american society? a) this case made no impact upon american society. b) it made segregation illegal and said that "separate was not equal." c) it upheld segregation laws and made segregation the law of the land. d) it made the thirteenth and fourteenth amendments invalid in the constitution.