Labor Day is today in the United States, marking the 125th anniversary of the federal holiday and the unofficial end of summer. The holiday celebrates workers across the United States.

President Grover Cleveland signed the law in 1894 after agitation from union workers. Several municipal and state celebrations came before it officially became a national holiday, with union leaders organizing many of those early celebrations.

Since the late 19th and early 20th century, labor union support in the United States has fluctuated. It hit an all-time low in 2009 when Gallup recorded a 48 percent approval rate for unions. A decade later, unions now enjoy a 64 percent approval rate, rebounding by 16 percentage points. This is the third consecutive year that Gallup has recorded a union approval rate above 60 percent.