20. the attempt by the soviet union to place missiles in cuba was an event that became known as
the bay of pigs invasion
star wars.
détente
the cuban missile crisis.

The answer would be D.)The Cuban Missile Crisis.

The Bay of Pigs was a coup led by Cuban rebels in 1959, which was three years earlier.

The Star Wars (yes, that's what it's actually called,) was a proposed early-warning system that would destroy Russian missiles if they were launched. (Also known as the strategic defense initiative.)

Finally, detente was a term most commonly used during the Cold War, meaning to ease strained relations.

Hope I could help! :)

the   square   deal   was   a   program   where   the   government gave any one   a fair   chance   to succeed