The first two countries to begin fighting in the conflict that later became known as world war i were
a) austria-hungary and serbia.
b) belgium and germany.
c) france and italy.
d) russia and poland.
e) austria-hungary and germany.

A)    Austria-Hungary and Serbia. It had begun when Austria-Hungary invaded Serbia.  There was confusion on among the Central Powers as Austria-Hungary fought two fronts in Serbia and Russia.  Germany was supposed to support them but instead fought with the French.

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.