What Soviet action led to the threat illustrated on this map?

A. The placement of nuclear weapons installations in Cuba.

Explanation:

The Brinkmanship policy between the United States and the Soviet Union resulted in the Cold War. The connection between Cuba and Russia began during the Cuban Revolution in 1959 when Fidel Castro managed to defeat  Fulgencio Batista. During this period, Cuba received military and financial support from the Soviet Union. The Soviet place nuclear missiles in Cuba in 1962 which threaten the U.S. and other neighboring countries.

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b) a state law could be declared illegal if it contradicted the constitution.

explanation:

the conflict of this case originated when james w. mcculloch, a cashier of the baltimore branch of the second bank of the united states that the congress had chartered in 1816, refused to pay a tax imposed by the maryland state.

in the case, the state of maryland appealed that the establishment of a second bank was unconstitutional since the constitution didn't say anything about granting that power to congress. however, the case determined that even if such right wasn't specifically stated in the constitution, it was part of the "implied powers" of the government enunciated in article i, section 8.

the case also eliminated maryland's legislation to impose taxes to a national bank, asserting that even though the states retained the power of taxation, the constitution's laws are supreme and can not be controlled by the states, therefore, if a state law contradicts the constitution, it should be declared illegal.

explanation: