Can someone please help me​

What significance does alfred t. mahan have on expansion and imperial policies of the late 1800s?

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

Identify a reason for the decline of the roman empire.