Some factors include: natural resources, immigration, government, entrepreneurs and inventors. It led to rising standard of living, improvement of transportation, and growing populations.
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Explanation: POINTS I NEED THEM
The United States first began developing nuclear weapons in 1939, during World War II, under the order of President Franklin Roosevelt. Motivation was the fear that US was engaged in a race with Nazi Germany to develop nuclear weapon. This project is best known as Manhattan Project.
