Which is the best explanation for why Mesopotamians built canals? O They needed a way to control low water levels.
O They needed a way to control the surplus.
O They needed a hoy to control the river's flow.
They needed a way to control flooding.

Examine these two paintings that depict famous events from american history. the image on the left, painted in 1940, shows the signing of the u.s. constitution in 1787. the image on the right, painted in 1836, shows the american victory at the battle of yorktown in 1781.which of these paintings should be considered a secondary source?