On this day in 1943, during World War II, in Denmark, a general strike against the Nazi occupation began.
On this day in 1957, US Senator Strom Thurmond began a filibuster to prevent the Senate from voting on Civil Rights Act of 1957; he stopped speaking 24 hours and 18 minutes later, the longest filibuster ever conducted by a single senator.
On this day in 1963, the Reverend Martin Luther King, Jr. gave his I Have a Dream speech
And on this day in 2003, an electricity blackout cut off power to around 500,000 people living in south east England and brought 60% of London's underground rail network to a halt.