What was the Soviet Union?

The Soviet Union, officially the Union of Soviet Socialist Republics, was a federal socialist state in Northern Eurasia that existed from 1922 to 1991.

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."

four sitting presidents have been assassinated while in office but the first was abraham lincoln,