Which senior officer last Fort Union before the Civil War to return to a Confederate state

Ulysses S. Grant

Ulysses S. Grant was the final commander of the Union Army. He was famous for his victories in the West when he was appointed lieutenant general and general-in-chief of the Union Army in March 1864.

Explanation:

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."