What challenges did the United States face after the Civil War ended? Check all that apply.
The future of more than four million formerly enslaved people was unknown.
The industrial economy of the North was failing.
The country needed to be reunified.
The costly war had resulted in debt.
Southern farmland and infrastructure were devastated.
DONE

1,3,4,5

Explanation:

The future of more than four million formerly enslaved people was unknown.

the country needed to be reunified.

The costly war had resulted in debt.

Southern farmland and infrastructure were devastated.

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the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.