1. A cause and effect diagram is
shown below.

•Annexation of Texas
•Boundary dispute
•American imperialism

Which of the following best completes this diagram?

A. War of 1812 began
B. Monroe Doctrine enacted
C. Mexico and Panama colonized
D. Mexican-American War broke out

How did the russian revolution impact world war i? a) the russians required the allied powers to come to their aid and defeat the radical groups. b) the russians pulled out from the war, enabling the germans to focus on the western front. c) the russians created new technological advancements that were used by the allied powers to win. d) the russians created a new communist government that aligned with the central powers instead.