Answer:
Secretary of government John Quincy Adams came to a diplomatic coup in 1819 after years of negotiations, with the signing of the Florida Purchase Treaty which formally placed Florida on US hands at no expense over and above U.S. assumption of some $5 million in US public debt claims against Spain.
Explanation:
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The correct answer is Ethel and Julius Rosenberg.
Here is why the other answers are incorrect.
Joseph McCarthy was a US Senator focused on exposing communists in American society. His actions help sparked the House Un-American Activities Committee, which lead to innocent citizens being blacklisted by Congress.
Sacco and Vanzetti were two Italian immigrants convicted of murder. However, the lack of evidence caused citizens to believe that these individuals were wrongly convicted/executed due to their political belief in the system of anarchy.
Elizabeth Gurley was a woman's right activists and also helped in the development of labor unions during the World War I era.
It was the belief that it was destiny for the Caucasians to expand and to take over North America. This caused conflicts when the Caucasians wanted to take land from the native Americans.
The French Revolution showed that the people could overthrow an unjust monarch. These two events inspired revolutions in Latin America, which had profound effects on the Spanish, Portuguese and French colonies in the Americas. The results were the end of colonial rule that had lasted 300 years.
