I don’t know how to do this, can someone help please?

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."

porter is writing economic history because he is focusing on the cost of developing vaccines.

this is a good question! i'll do some research and come back when i have the answer!