Name the inventions attributed to the sumerians

Where did people have to work with great organization to be successful at farming? a. on the yellow river basin c. on the hangzhou bay b. on the yangzi river basin d. on the hubei basin

The event shown in the map is a cause of which of the following? *pic* gadsden purchase battle of the alamo bear flag revolt settlement of texas

Can someone me out with this , i'm putting 30 points on it