Which example shows how prehistoric people adapted to their environments

- "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 soviet union wanted to impose communist governments in eastern europe.

if i am correct the answer is going to be a) the federal program of reconstruction ended.