Answer:
the correct answer is option C.
Explanation:
World War 1.
Many blacks left southern states during WW1 and moved to big northern cities to work in war industries.
More went to New York city than to any other,and after the war there a lot of blacks living in Harlem who were literate and artistic.
<span>go to https://en.wikipedia.org/wiki/Yuan_Shikai
and it will tell you everything about him
</span>
I'm sure about the third one,but not so sure about the rest.Best of luck!
D is one way to tell a chemical change has occurred