Was the main cause of the death of
Reconstruction

Historians overwhelmingly have blamed the demise of Reconstruction on Southerners' persistent racism. Heather Cox Richardson argues instead that class, along with race, was critical to Reconstruction's end.

Explanation:

Historians overwhelmingly have blamed the demise of Reconstruction on Southerners' persistent racism. Heather Cox Richardson argues instead that class, along with race, was critical to Reconstruction's end.

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )