One of the most famous St. Patrick's Day parades in the world just made history.

Beloved St. Patrick's Day Parade Makes History
U.S. Rep. Seth Moulton, D-Mass., center without hat, marches with members of OutVets, a group of gay military veterans, during the St. Patrick's Day parade, Sunday, March 15, 2015, in Boston's South Boston neighborhood. Until now, gay rights groups have been barred by the South Boston Allied War Veterans Council from marching in the parade, which draws as many as a million spectators each year. (AP Photo/Steven Senne)
U.S. Rep. Seth Moulton, D-Mass., center without hat, marches with members of OutVets, a group of gay military veterans, during the St. Patrick's Day parade, Sunday, March 15, 2015, in Boston's South Boston neighborhood. Until now, gay rights groups have been barred by the South Boston Allied War Veterans Council from marching in the parade, which draws as many as a million spectators each year. (AP Photo/Steven Senne)

This was more than 20 years in the making.

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