If a country had 4 million people in 2000 and 4.5 million people in 2010, but only 2,500 people moved into the country between those years, which of the following factors must have contributed to the population change?

cv

Explanation:

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.

omg stop xd you need to chi