It was resolved with the 3/5 compromise, which stated that an African American was counted as 3/5 of a person for population purposes.
Airplanes were vital for ww1 to ease transport of amo and soon guns on the planes including bombs this made it easier for to launch quick air strikes on places like bases vulnerable to air strikes
I believe B.<span>The U.S. lent military supplies in exchange for bases.</span>
I believe your answer to this is the Nubian civilization.
It would be the oasis and aquifers provide water to the people. In the arid places people tend to supply by travelling around the desert and stopping in areas that has oasis and aquifers in order to replenish their water supplies. Also oasis and aquifers become stopping posts if it is a trade route for merchants and travelers in the arid regions.
