The first nuclear weapons to be used against another nation were dropped a. by the united states during world war ii. b. by the united states during the cold war. c. by the soviet union during world war ii. d. by the soviet union during the cold war.

A

Explanation:

they were dropped on 2 Japanese cities

Nagasaki

Hiroshima

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the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain