The thirteenth, fourteenth, and fifteenth amendments all extended voting rights to citizens. were ratified during the civil war. faced little resistance from the nation. secured rights for african americans.

Secured rights for African Americans.

Explanation:

The Thirteenth, Fourteenth, and Fifteenth amendments were a series of legislation that aimed at recognizing the basic liberties of all race as an attempt to secure rights for African Americans, since it was them who had been harshly discriminated and mistreated for decades.

The amendment recognized African Americans and all races in the U.S. as equal humans beings by prohibiting slavery (13th), by declaring that all person born or naturalized in the U.S. were citizen thus they had to be protected equally under the law, meaning that discrimination should not be accepted anymore (14th); and by guaranteeing the citizen's right to vote regardless of their race, color, or previous condition of servitude (15th).

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).