What was significant about the Ethel and Julius Rosenberg case? A) The asked the Supreme Court to hear their case
B) They were the subject of worldwide appeals for clemency
C)They were the first US civilians to be executed for espionage
D) They used the Fifth Amendment to avoid incriminating themselves

secretly cooperate with one another.

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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