Which Amendment allows citizens to vote at the age of 18?​

The Twenty-sixth Amendment

Explanation:

The 26th amendment

Explanation:

The right of citizens of the United States, who are eighteen years of age or older, to vote shall not be denied or abridged by the United States or by any State on account of age.

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".