Then, exhausted by the war and constant criticism, Lyndon Johnson declared he would not run for President again in November, as he was expected to do. That was late March, and it opened the door for Senator Robert Kennedy, , former Attorney General and brother of the late President to be the front runner for the Democratic Party. Just within days, possibly the same week as Johnson said he would not run, Martin Luther King was assassinated in Memphis. 2 months later, Robert Kennedy was assassinated in Los Angeles after winning the California primary and pretty much assuring he would win the Democratic nomination later that summer.
The Democratic convention came and the party nominated Vice President Hubert Humphrey, but he was beaten in November by Richard Nixon, in a close race. Nixon promised to end the war, but it took until Jan. of 1973 to do so and that was after the Watergate break ins that would bring Nixon down. The Democratic convention in Chicago was marred by violence, anti war demonstrations, and even some fights on the floor of the convention among delegates.
Apollo 8 ended the year (or at least on Christmas) with the first manned orbits of the moon. They did not land, but were just being sure the space craft could make it there and back.
To one of the posters who questioned the importance of 1968: It is not THE most important...