Answer:
In the summer of 1939, American newspapers began to discuss the prospects of using atomic energy. Although physicists reported new advances in this field, many Americans doubted that nuclear weapons could be created. Leo Silarda, a physicist from Hungary, was worried that America had not shown itself in such a serious matter: this could be an advantage for Nazi Germany.
Sylard himself could not find support in the government and decided to seek help from his friend Albert Einstein. Sylard told him that the atomic bomb can be created with the current achievements of science. Sylard’s request was that Einstein warned the Belgian queen, who could protect large reserves of uranium ore in the Belgian Congo from the Nazis.
Explanation:
Immigrants desired to come to the United States in order to obtain better job opportunities, and escape ongoing wars in their homeland. (Might not be the best, just kinda thought of it on the spot)
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European explorers came from an ancient maritime tradition. Naval practice coupled with star-tracking, as well as associated navigation technology, aided navigators by helping them stay on routes, avoiding course problems, and thus preventing them from being lost frequently.
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I assume the middle ages are called the dark ages because that is when the great depression was or something im not sure
The greatest European superpower, with the largest landholdings during the age of imperialism was "Great Britain," since they had control of some of the most advantageous locations in Africa, along with places like India that greatly enriched them through trade.