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On May 4, 1977, the film "Star Wars" by George Lucas was released in the US — it became the highest-grossing film in history up to that point and founded one of the most successful narrative universes in entertainment history. The phrase "May the 4th be with you" (a pun on "May the Force be with you") has turned May 4 into Star Wars Day.

On May 4, 1970, the Ohio National Guard opened fire on students protesting at Kent State University against the American invasion of Cambodia, killing four young people and wounding nine. The Kent State Massacre shocked American public opinion and was captured in John Filo's iconic photograph of a young woman kneeling and weeping over a dead student. The image became a symbol of the anti-Vietnam movement.

On May 4, 1979, Margaret Thatcher became the first woman to lead the United Kingdom, following the Conservative Party's victory in the general election. "The Iron Lady" governed for 11 years and 209 days, implementing radical neoliberal reforms — privatisations, reduction of the state, attacks on union power — that transformed the British economy and Western political thought.