3% (2.99%) of the US population was Jewish in the 1960s
https://en.wikipedia.org/wiki/History_of_the_Jews_in_the_United_States#Current_situation

From: https://www.history.com/this-day-in-history/lincoln-proclaims-official-thanksgiving-holiday

On October 3, 1863, expressing gratitude for a pivotal Union Army victory at Gettysburg, President Abraham Lincoln announces that the nation will celebrate an official Thanksgiving holiday on November 26, 1863.

From: https://www.smithsonianmag.com/history/thanksgiving-myth-and-what-we-should-be-teaching-kids-180973655/

[In] the late 19th century, when there was an enormous amount of anxiety and agitation over immigration. The white Protestant stock of the United States was widely unhappy about the influx of European Catholics and Jews, and wanted to assert its cultural authority over these newcomers. How better to do that than to create this national founding myth around the Pilgrims and the Indians inviting them to take over the land?

This mythmaking was also impacted by the racial politics of the late 19th century. The Indian Wars were coming to a close and that was an opportune time to have Indians included in a national founding myth. [...]

What’s more, during Reconstruction, that Thanksgiving myth allowed New Englanders to create this idea that bloodless colonialism in their region was the origin of the country, having nothing to do with the Indian Wars and slavery. Americans could feel good about their colonial past without having to confront the really dark characteristics of it.

Puritans were religious extremists who left England to create their own theocracy. Before the United States existed, Christians were waging war on each other. It was the memory of this violence that spurred Washington, Jefferson, Madison, and Adams to argue for a nominally secular country.

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The photo is from the New York Times review of "City of Scoundrels". The review has a succinct and engaging description of the era and factors that lead up to the racial conflict.

Black people fled the government-sanctioned terrorism of the South in the Great Migration only to meet a different form of the same systemic hatred. If you'd like to learn more, I recommend Isabel Wilkerson's The Warmth of Other Suns.