What is Memorial Day? When does it take place in the United States of America? Learn all there is to know about the occasion.

Originally called Decoration Day, Memorial Day, observed on the last Monday of every May honors all soldiers who died during service to the nation. Memorial Day was declared a national holiday through an act of Congress in 1971, and its roots date back to the Civil War era, according to the U.S. Department of Veterans’ Affairs. Unlike Veterans Day, Memorial Day honors all military members who have died in while serving in U.S. forces.

The origins of the holiday can be traced back to local observances for soldiers with neglected gravesites during the Civil War. The first observance of what would become Memorial Day, some historians think, took place in Charleston, S.C., at the site of a horse racing track that Confederates had turned into a prison holding Union prisoners. Blacks in the city organized a burial of deceased Union prisoners and built a fence around the site, Yale historian David Blight wrote in The New York Times in 2011.

Then on May 1, 1865, they held an event there including a parade – Blacks who fought in the Civil War participated – spiritual readings and songs, and picnicking. Despite conflicting claims, the U.S. Congress and President Lyndon Johnson declared Waterloo, New York, as the “birthplace” of Memorial Day on May 30, 1966, after Governor Nelson Rockefeller’s declaration that same year. The New York community formally honored local veterans May 5, 1866 by closing businesses and lowering flags at half-staff.

Why is Memorial Day celebrated in May every year?

It turns out that the reason for Memorial Day being celebrated in May every year is rooted in American history.

The day that we celebrate Memorial Day is believed to be influenced by Illinois U.S. Representative John A. Logan, who was elected to the U.S. House of Representatives as a Democrat in November 1858, and served as an officer during the Mexican War.

It is said that Logan, a staunch defender of the Union, believed Memorial Day should occur when flowers are in full bloom across the country, according to the National Museum of the U.S. Army.

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