In 1832 South Carolina threatened to secede from the union over what issue A. a law to abolish slavery
B. the seizure of Indian lands
C. the admission of Missouri to the union
D. the imposition of higher tariffs

these civilizations were located around fertile rivers, where they could produce an abundance of crops

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.