The berlin crisis of 1961 was precipitated by soviet premier khrushchev's threat to a. place nuclear missiles in east berlin b. sign a separate peace treaty with east germany, permanently dividing germany c. send soviet troops into east germany to crush attempts at political liberalization d. annex east germany, thereby making it a republic within the u. s.s. r.

sign a separate peace treaty with East Germany, permanently dividing Germany

- "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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offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering