After confederate troops opened fire in fort Sumter, approximately how long did it take for the union surrendered

34 hours

Explanation:

At 4:40 a.m. on April 12, 1861, Confederate cannons opened fire on Fort Sumter and Union forces surrendered 34 hours later.

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.

the hyksos invasion. the hyksos were able to attack egypt successfully because of their skills in using bronze weapons, composite bows and the use of the horse and chariot during the invasion. although the egyptians depict a barbarian-type overthrow, the truth is the seizure was likely a relatively peaceful one.