When did feudilism begin?

a) before the viking, magyar, and muslim invasions.
b) during the period of viking, magyar, and muslim invasions.
c) shortly after the period of viking, magyar, and muslim invasions.
d) long after the period of viking, magyar, and muslim invasions.

Which of the following was not an effect of westward expansion? a. native american tribes suffered confinement on reservations. b. native americans learned new techniques of irrigation. c. many native americans died from the spread of disease. d. natural resources were depleted from misuse by white settlers.

Before the civil war, the constitution protected slavery -true -false

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste