20 POINTS A major goal and outcome of the Sibley expedition involved
A. collecting soil samples of the Great Plains
B. claiming Oklahoma land for the United States
C. establishing peaceful relations between Americans and important American Indian tribes
D. demonstrating that the Great Plains had rich mineral deposits to mine

Which of the following describes an effect of world war ll on the united states economy a. automobile companies produced a record number of cars b. many factories had to expand to produce military equipment c. the airplane industry suffered as the allies began using airplanes in combat d. cities with shipyards declined because so many ships had been sent overseas.