The “third” wave of immigrants came mostly from where?

They mostly came from Eastern and Southern European cities.

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"Third" wave immigrants came mostly from South and East of Europe.

Explanation:

"Third" wave of immigration, which took place roughly between 1850 and 1930, originated from Southern and Eastern Europe. It is estimated that approximately 25 million people arrived during that period, with a large number of Italian immigrants (mostly Catholics) and many nationalities of Eastern Europe, including Poland, Hungary, Romania, Czechoslovakia, Russia and Baltic nations.

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."