As more settlers moved west, how did they interact with native tribes? a. they forced the tribes to move to other areas. b. they struck treaties that favored the settlers. c. they struck treaties that favored the tribes. d. they paid the tribes a lot of money for their land.

Which suggests the most critical aspect of the peak oil theory? 1) controversy rages over rumors that the fracking lobby in washington has influenced the statistics. 2) supporters and critics argue endlessly over the rate of extraction and shape of the bell curve. 3) saudi arabia will soon have to begin fracking, leading to protests and further destabilization. 4) a new oil discovery means a fresh peak cycle, making that region the target of aggressors.