The 250th anniversary of American independence is colliding with political polarization and a heat wave as celebrations get underway across the United States on Saturday.

The 250th anniversary of American independence is colliding with a country gripped by political polarization and a heat wave bearing down on millions of people across multiple states as celebrations g

Philadelphia canceled its Independence Day parade on Friday, a victim of heat gripping the eastern U.S. and hurting America's 250th birthday.