On August 21, 1968, which nation was invaded by the Soviet Union and other Warsaw Pact forces?

Which U.S. president was born on August 19, 1946, in Hope, Arkansas? "August 1914", a novel about the first days of World War I, was written by which author of "The Gulag Archipelago"? In August 1983, which reusable U.S. spacecraft made its first night launch, carrying Guion Bluford, the first African A… Which U.S. president died on August 2, 1923, in San Francisco? In August 1962 which French president survived an attack on his limousine near Paris? On August 22, 1989, which pitcher became the first to reach 5,000 career strikeouts? Which Peanuts character, introduced in 1959, is Charlie Brown's younger sister? Which U.S. president was born on August 27, 1908, near Stonewall, Texas?