Answer:
As a result of the lousiana purchase.
(i'd appreciate brainliest)
The difference between endothermic and exothermic reactions lies in the words themselves. "Thermic" refers to heat, just as in the word "thermometer." "Exo" means "outside" and "endo" means "inside." Thus, an endothermic reaction pulls heat into an object or area, while an exothermic reaction expels heat.
Monopolies is your best answer..hope this helps!
D. Because they were so valuable