1991

1991 was the year the Soviet Union broke up, which ended the first Communist state in the world, beginning in 1917, and also ended the Cold War, which began in the late 1940s.

Conservatives

Here we're parodying Conservapedia, and we know we're exaggerating.

1991 is also the 1991st number after zero. Conservatives were afraid of it because of this reason, see 666. Then they changed their attitude towards it because of the break up of the USSR. Now they love 1991.