An act or means of sealing off a place to prevent goods or people from
entering or leaving.

typical characteristics of global cities include all of the following except being culturally isolationist.

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."