In what industry did the Mexicano's help the American settlers develop due to their knowledge and techniques? A.) Gold B.) Silver C.) Copper D.) All of the above

What was one of the most important causes of the russian revolution of 1917? a. the german occupation of russia during world war ii b. the bolsheviks execution of czar nicholas ii and his family c. csar nicholas ii refusal to withdraw from world war 1 d. the policy of ethnic discrimination put in place by the duma