What were the causes of world war 1 and how did americans help the allies during the war?

By the time the war was over and the Allied Powers claimed victory, more than 16 million ... The spark that ignited World War I was struck in Sarajevo, Bosnia, where ... with hundreds of American passengers onboard—in May 1915 helped turn the tide ... Though his most popular plane during WWI was the single-seat Fokker

Explanation:

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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.