Why were many northern politicians willing to abandon reconstruction efforts in 1877?

As tensions rose between the Republican and Democratic parties, many believed a second Civil War was coming if Reconstruction did not end.

C.) Removing federal troops from the south cut a major government expense at a time when the federal budget was right.

Explanation:

An economic downturn in the early 1870s caused many northern politicians to feel Reconstruction was too expensive for the federal government. This, along with their desire to ensure the election of President Hayes, cause many Republicans to agree to end Reconstruction in the south.

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explanation:

the answer would be a).