Like today in 2021, a new study suggested the asteroid that wiped out the dinosaurs 66 million years ago created South America's tropical rainforests.

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Like today in 1968, US President Lyndon B. Johnson authorised a troop surge in Vietnam, bringing the total number of US soldiers to a peak of 549,500.

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Like today in 1852, Ohio made it illegal for children under 18 and women to work more than 10 hours a day.

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Like today in 1915, the first submarine disaster took place; a US F-4 sank off Hawaii, killing 21.

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