How were the cahuilla able to grow crops in the dry desert

Why was frederick douglass encouraged by the dred scott decision?

How does specialization enable countries to trade with one another? a country can make and sell goods affordably and buy goods that it is inefficient at making. a country can make what it chooses and sell its goods to other countries. a country can decide to buy everything it needs from other countries. a country can efficiently make goods that were once difficult to make.

What was the french and indian war about