April 18: 178,000 employees of the U.S. Bell Telephone System go on strike.
April 18: The London Bridge is sold to U.S. oil company McCulloch Oil. The bridge was disassembled and then rebuilt at Lake Havasu, Arizona.
April 20: Pierre Elliott Trudeau was sworn in as prime minister of Canada. He succeeds Lester B. Pierson.
April 21: At the 22nd Tony Awards, “Rosencranz & Guildenstern” wins for best play and “Hallelujah Baby” wins for best musical.
The Whole World Was Watching: An oral history of 1968. A joint project between South Kingstown High School and Brown University’s Scholarly Technology Group
Timelines of History
Wikipedia Music Timeline
Frank Eugene Smitha’s Macrohistory and World Report