Hi , the answer is 100 million years .
Dred Scott would remain a slave and, as a slave, was not a U.S. citizen and was considered property. The Chief Justice of this case, John Marshall, said that Scott shouldn't have even brought his case to court because he is a slave.
The answer is C.
As a science website says, "Scientists think they know why the Ancestral Puebloans disappeared. The primary culprit, studies suggest, was a megadrought that would have made it impossible to grow enough food to feed the tens of thousands of people living in the region."
If you didn't know, drought represents the lack of rain.
Outlays for troop training, weapons, and munitions increased fifteen-fold from 1916 to 1918. In addition, the Treasury lent generously to US allies. Spending quickly outpaced tax revenues, and the Treasury mounted a series of war bond or “liberty loan” drives to raise additional funds.
