(CNN) — On this day in 1865 — commemorated now as Juneteenth — news of emancipation reached the enslaved people of Texas. The complete abolition of slavery, which became irrevocable later that year with the ratification of the 13th Amendment, meant the end of involuntary servitude and the beatings, assaults and torture that often accompanied it.

It also meant the end of forced family separation, in which children were wrenched away from their parents for the profit and convenience of the slaveholding authorities. We know from the surviving slave narratives that the legalized seizure of children was among the most dreaded incidents of American slavery. As one memoirist put it, the “bitter and cruel punishments … were as nothing to the sufferings I experienced by being separated from my mother.”

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Juneteenth is the oldest known US celebration of the end of slavery. African-Americans and others mark the anniversary much like the Fourth of July, with parties, picnics and gatherings with family and friends. Here’s a look at Juneteenth, also called Emancipation Day, by the numbers:

153 – Years since Maj. Gen. Gordon Granger (Union Army) first read the proclamation, General Orders, No. 3, in Galveston, Texas, notifying slaves of their emancipation, on June 19, 1865.

January 1, 1863 – Date President Abraham Lincoln issued the final Emancipation Proclamation, freeing those enslaved.

901 – Days in between the issuance of the Emancipation Proclamation and General Orders, No. 3.

13th – Amendment to the US Constitution that abolished slavery.

3,953,760 – Estimated number of slaves in the United States in 1860.

30.2 – Percentage of the population of Texas comprised of slaves, or “bondsmen,” in 1860.

500,000 – Estimated number of free blacks in the United States in 1860. According to Encyclopedia Britannica, about half were in the North and half were in the South.

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15 – States where it was legal to have slaves before the Civil War: Alabama, Arkansas, Delaware, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, Missouri, North Carolina, South Carolina, Tennessee, Texas and Virginia.

45 – States with laws or resolutions celebrating Juneteenth.

January 1, 1980 – Juneteenth became a state holiday in Texas, although it had been celebrated informally since 1865.

“Every year we must remind successive generations that this event triggered a series of events that one by one defines the challenges and responsibilities of successive generations. That’s why we need this holiday.” — Al Edwards (D-Texas), sponsor of the bill.

45,133,880 – African-Americans (one race alone or in combination) in the United States in 2016, according to the most recent Census Bureau estimate.

145 years – Age of the oldest Juneteenth celebration in the world, in Emancipation Park in Houston.

8 – Consecutive years during which Barack Obama, during his presidency, issued a statement to mark Juneteenth: 2009-2016.

2016: Obama’s statement

40 – Congressional co-sponsors of House Resolution 268, Texas Rep. Sheila Jackson Lee’s bill to “observe the historical significance of Juneteenth Independence Day,” introduced in the House on June 17, 2013. It has been referred to the House Committee on Oversight and Government Reform.

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