1. The Battle of Pelham: On June 9, 1777, the Battle of Pelham took place during the Revolutionary War. It was a minor skirmish between the British and the Americans, but it ultimately helped the Patriot forces hold onto Westchester County.

2. The Tompkins Square Riot: On June 9, 1857, a riot broke out in Tompkins Square after police clashed with demonstrators who were protesting a ban on public speaking. Dozens of people were injured in the violence that ensued.

3. The opening of the Brooklyn Bridge: On June 9, 1883, the Brooklyn Bridge officially opened to the public. It was the first steel-wire suspension bridge ever constructed, and it quickly became an icon of New York City.

4. Robert F. Kennedy's assassination: On June 9, 1968, Senator Robert F. Kennedy was assassinated at the Ambassador Hotel in Los Angeles, California. However, he had deep ties to New York City; he served as the state's junior senator from 1965 to 1968 and held his presidential campaign launch at Madison Square Garden.

5. The Stonewall Riots: On June 9, 1969, a year after the Stonewall Inn was raided by police, LGBTQ+ protesters gathered outside the bar to commemorate the event. The peaceful demonstration quickly turned violent, sparking a series of riots and protests that marked a turning point in the modern LGBTQ+ rights movement.