What is the bering land bridge theory? answer

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."

it was on the rise and doing very well and would continue to do well until the great depression from 1929-1939