In World War II the world lost 50 to 70 million people, mostly Europeans, including millions of Jews, which was nearly 35.3% of the world Jewish population. Between 1935 and 1940, 12 percent of the population moved to another county or state. This represented a lull in population movement that changed during and after WWII as geographic mobility increased in the U.S. For instance, between 1940 and 1947, 21.5 percent of civilians moved to different counties or states.
Teddy Roosevelt and Woodrow Wilson used American power around the world during their presidencies.
Roosevelt
-The Roosevelt Corollary to keep European nations out of Latin America
-Started revolt in Panama to be able to create the canal
Wilson
-Invaded Veracruz, an important Mexican port
-Did not recognize a Mexican government that was against American ideals.
He was a commodore in the United States Navy who, in 1846, claimed California for the United States.
To get wealthy and expand empires which worked until the Chofu American cough revolution cough. Hope this helps