It was the battle of the bulge.
Answer:
Between 1870 and 1900, the largest number of immigrants continued to come from northern and western Europe including Great Britain, Ireland, and Scandinavia. But "new" immigrants from southern and eastern Europe were becoming one of the most important forces in American life.
Explanation:
i think it is B
Mongol Rule and the Yuan Dynasty
B is what I think sorry if I am wrong