Why did the united states enter the war on the side of the allies?
a. austria-hungary began using zeppelins against american colonies
b. germany resumed unrestricted submarine warfare on allied shipping
c. the ottomans massacred tens of thousands of armenian men and boys
d. the british were in danger of losing their colonies in africa
i think it's either a or d but i'm note sure which one. i'm not good with history so i could be wrong with either of those choices.

B. Germany resumed unrestricted submarine warfare on Allied shipping

Explanation:

just took the test :D

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abraham lincoln  (february 12, 1809  – april 15, 1865) was an american statesman, politician, and lawyer who served as the 16th  president of the united states  from 1861 until  his assassination  in april 1865. lincoln led the nation through the  american civil war, its bloodiest war and its greatest moral, constitutional, and political crisis.[2][3]  he preserved the  union,  abolished slavery, strengthened the  federal government, and modernized  the u.s. economy.

c) he felt the constitution clearly gave states this right.