Why is the civil rights a momvement and not a singular event in our history?

The civil rights movement[b] in the United States was a decades-long campaign by African Americans and their like-minded allies to end institutionalized racial discrimination, disenfranchisement and racial segregation in the United States. The movement has its origins in the Reconstruction era during the late 19th century, although it made its largest legislative gains in the mid-1960s after years of direct actions and grassroots protests. The social movement's major nonviolent resistance and civil disobedience campaigns eventually secured new protections in federal law for the human rights of all Americans.

Explanation:

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the passage of a strict fugitive slave law

on november 6 and 7, 1917 (or october 24 and 25 on the julian calendar, which is why the event is often referred to as the october revolution), leftist revolutionaries led by bolshevik party leader vladimir lenin launched a nearly bloodless coup d'état against the duma's provisional government.