New technology during WW1. Check all that apply: * a) Boeing B-17
B) Chemical warfare
c) M3 grease gun
d) Machine gun

Which of the following encouraged westward expansion? a.the government decreased the price of federal land. b.each of these represents actions taken to encourage westward expansion. c.the government decreased the price of federal land d.the second national bank lowered the cost of borrowing money (reduced interest rates)