Republican presidential candidate Sen. Marco Rubio, R-Fla., smiles as he greets his supporters as he arrives to the staging area for the Fourth of July parade, Saturday, July 4, 2015, in Wolfeboro, N.H. (AP Photo/Mary Schwalm) ** FILE **
President Andrew Johnson looked to the Fourth of July as a launching point to reunify not just the states, but also the hearts and minds of their inhabitants. (Associated Press)
A group of activists from New York plan to burn the American flag heading into the 4th of July weekend. "Disarm NYPD" is hosting its flag burning event at Fort Greene Park in Brooklyn, N.Y. at 7:30 p.m. (Facebook, Disarm NYPD) ** FILE **
Volkswagen employees Ghezal Khalil, left, and Baiba Simanich, right, help clean up firework debris on the National Mall after the July 4th weekend, Washington, D.C., Monday, July 7, 2014. (Andrew Harnik/The Washington Times)
Volkswagon employee Sean Maynard helps clean up firework debris on the National Mall after the July 4th weekend, Washington, D.C., Monday, July 7, 2014. (Andrew Harnik/The Washington Times)
Volkswagon employee Chris Riemer, left, wipes his face as he helps clean up firework debris on the National Mall after the July 4th weekend, Washington, D.C., Monday, July 7, 2014. (Andrew Harnik/The Washington Times)
Fireworks debris still litter areas near the Reflecting Pool on the National Mall after the July 4th weekend, Washington, D.C., Monday, July 7, 2014. (Andrew Harnik/The Washington Times)
The Nebraska Democratic Party is calling a Fourth of July parade float that poked fun at President Obama the "worst shows of racism and disrespect for the office of the presidency that Nebraska has ever seen." (Omaha World-Herald)
R.J. Delgado-Borrero, 5, waves his flag as the Fourth of July parade goes by in downtown Pittsfield, Mass., Friday, July 4, 2014. (AP Photo/Stephanie Zollshan, The Berkshire Eagle)
Fireworks light up the Empire State and Chrysler buildings along the Manhattan skyline during Macy's 37th Annual Fourth of July fireworks show in New York. (AP Photo/John Minchillo)
In a on July 2, 2013 photo, Chuck Amalong, left, and Brent Mattix help prepare Lake Tahoe’s Fourth of July fireworks display at Tahoe Keys Marina in Lake Tahoe, Calif. A federal lawsuit accusing the Lake Tahoe Visitors Authority of polluting the alpine lake with debris from Fourth of July and Labor Day fireworks says the authority and its contractor should be subject to up to $75 million in fines for thousands of violations of the Clean Water Act over the past five years. (AP Photo/The Tahoe Daily Tribune, Dylan Silver)
President Bill Clinton, left, and Nelson Mandela listen during Fourth of July ceremonies in Philadelphia during which Clinton presented the Philadelphia Liberty Medal to the African National Congress president and South African President F.W. de Klerk Sunday, July 4, 1993. (AP Photo/Greg Gibson)