Which theme or themes of geography does the Mississippi River Valley represent?

region and location

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."

cultural/diplomatic relations. most medieval japanese   culture has chinese origins. writing, architecture etc.