Prague spring involved the warsaw pact invasion of .

Czechoslovakia

Explanation:

The invasion of Warsaw Pact member states (except Romania) into Czechoslovakia began at 11 am on the evening of August 20 of 1968 with the crossing of the Warsaw Pact countries' combined forces across the Czechoslovak borders.

After half past three in the morning on August 21, airplanes, sirens and engines were heard in Prague. At three, all the lights were off in the capital. Speakers from the radio said that former allies were treacherous, that aggression had been committed, that the attack on Prague was a crime unknown in international law. At about three in the morning, Soviet commandos occupied the Prague airport, and then tanks flew from large planes toward the city center.

"a shortage of traditional labor created new opportunities in the workplace. a major cause of the internment of japanese americans during world war ii was. racial prejudice. in the early 1940's, the "destroyers-for-military-bases deal" with great britain and the lend-lease act were evidence that the united states."

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.