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On the sign:
The Great Meeting was a demonstration of 150,000 supporters of the Union cause. The flag that was fired upon at Fort Sumter was placed on the Washington statue
Part of a series of 22 plaques surrounding Union Square depicting the history of the square from 1600 to 1882 - the year in which the first Labor Day Parade took place at Union Square, and labor movement events that were held in the United States (Union)
The plaques are made of bronze, designed by Gregg LeFevre and set up in 2002
At the beginning of the civil war in the United States, after the inauguration of Abraham Lincoln and the bombardment of Port Sumter by the Confederate forces, the great meeting was held on April 20, 1861 in Union Square to support the Union. The flag from Fort Sumter was raised on the statue of George Washington.
The plaque is an exact replica of the May 4 photograph of Harpers Weekly drawn by Homer, Winslow, and is now in the public library of New York. See the original image in the site: The Union Square in New York City The Great Meeting in 1861