
A boy touches the flag during the annual Independence Day celebration in Durham, North Carolina as as the United States marked 239 years as an independent nation on Saturday, July 4, 2015. (AP Photo)

Kids wait for results in the Firecracker Pageant, in downtown Everglades City, Florida as the town kicked off July 4th festivities. (AP Photo)

An Elvis Presley stiltwalker stands tall on Main Street during the 60th annual Natick Fourth of July parade in Natick, Mass. (MetroWest Daily News via AP)

Baton twirlers march down North Grand Avenue during the 66th Annual Jaycees Independence Day Parade in Texas on Saturday, July 4, 2015. (Odessa American via AP)

United States ambassador to Canada Bruce Heyman, center, and wife Vicki, left, dance with guest at the U.S. ambassador's official residence in Ottawa, as they take part in July 4th celebrations, Saturday July 4, 2015. (The Canadian Press via AP)

Matt Stonie poses for photographs after winning the annual Nathan's Famous Fourth of July International Hot Dog Eating Contest men's competition in the Coney Island New York. (AP Photo)

US President Barack Obama spoke minutes before the annual Fourth of July fireworks lit up the night sky over the National Mall. He was accompanied by Michelle Obama. (AP Photo)

Fireworks over the National Mall for Fourth of July celebrations, as seen from 'Top of the Town' in Washington. (AP Photo)

The Empire State Building, left, is illuminated as fireworks explode over the East River in front of the Manhattan skyline during the Macy's Fourth of July fireworks show in New York. (AP Photo)

Fireworks explode over the Philadelphia Museum of Art during an Independence Day celebration. (AP Photo)

People hang from the Sky Flyer ride at the State Fair Meadowlands during a Fourth of July fireworks display in New Jersey. (AP Photo)

Fireworks explode behind a United States flag during a Fourth of July celebration at State Fair Meadowlands, Saturday, July 4, 2015, in New Jersey. (AP Photo)

Fireworks over the East River behind buildings during Fourth of July celebrations in New Jersey. (AP Photo)