Today in History: March 26, Francis Scott Key Bridge collapse in Baltimore

America 250: Iconic 1869 photo marks moment U.S. railroads linked east and west

Today in History: March 25, Triangle Shirtwaist factory fire in New York kills 146 workers

Today in History: March 24, Exxon Valdez runs aground off Alaska, creates massive oil spill

America 250: How the internal combustion engine transformed modern warfare

Today in History: March 23, ‘Titanic’ wins record-tying 11 Academy Awards