What did donald c. johanson and tom gray discover in 1974?

The approval of is the states was needed to ratify the constitution

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.

The 18th amendment banned the selling of alcohol and contributed to organized crime. true or false