They thought it would be over by Christmas
Einstein primarily emigrated to the United States because he had a Jewish background, and Adolf Hitler, who became Germany's chancellor in 1932, was about to adopt Anti-Semitic policies.
It was a very hard choice for Einstein to choose to emigrate to the United States, but it was a very wise one. As a Jew, he knew what was gonna happen if he stayed in the United States. You may already know that the Holocaust happened a few years later, in which most Jews living in countries occupied by Germany were murdered. Thanks to moving to the U.S, Einstein was safe from this event.
To offer medical assistance to Third World countries.
The imperialism movement of the 19th century did not show particular concern for the native peoples in the regions they came to control through imperialistic means. There were medical missions and religious missions that accompanied the imperialistic advance into other countries, but those were factors that accompanied the imperialistic advance more than they motivated it.
Also, as a false component of that option, the term "Third World" didn't come into existence until the era of the Cold War. The "Third World" referred to the developing nations that did not align with either of the superpowers, the USA or the USSR. No one was using the term "Third World" in the 19th century.
American factories were to produce goods to support the war effort and almost overnight the unemployment rate dropped to around 10%.
