How did the “Manhattan Project” change the world?

The Anglo-American Manhattan Project had launched the Atomic Age. Since then, the world's nuclear arsenal has grown to about 15,000 weapons, many with power exceeding the atomic bombs of World War II. ... Most Manhattan Project workers built and operated the uranium enrichment facilities and reactors

Explanation:

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in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.