Which of the following is correct: maximum number of people 'is' answering this.(or)maximum number of people are answering this.

In this sentence the use of "is" is incorrect, instead of "the maximum number of people is answering this"  it should be "the maximum number of people are answering this"

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.