What caused the ratification of the 26th Amendment, which lowered the voting age to 18?

A. Participation of the United States in the Vietnam War
B. Fear of McCarthyism
C. Reaction to the launching of Sputnik by the Soviet Union
D. Reporting of the Watergate scandal

- "schenck v. united states, case in which the u.s. supreme court ruled on march 3, 1919, that the freedom of speech protection afforded in the u.s. constitution's first amendment could be restricted if the words spoken or printed represented to society a “clear and present danger.” "

- speech aimed to potentially create danger could be banned.

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the constitution of the united states gave congress the absolute authority over immigration laws