A) - European governments found ways to pay for expensive wars.
C) - There was organization of labor on an international basis.
D) - European nations could not pay back their foreign loans.
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Many African nations were vulnerable to foreign influence and interference :)
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Placed legal restrictions on rulers who had once held absolute power
I hope this is the answer you are looking for :)
The answer is C, preserving the Union. Lincoln famously said, "If I could preserve the Union without freeing a single slave, I would."