Boston Marathon Bombing - HISTORY

Personal tragedy brought Carlos Arredondo, "the man in the cowboy hat," to the finish line that day, but his spontaneous act of heroism helped save a life and change the course of the investigation into the attack.

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Knocked down by the first blast, 78-year-old Bill Iffrig and his orange running jersey became an iconic image of the 2013 Boston Marathon bombings.

Reporter David Abel was shooting a documentary about the first woman with dwarfism to run the Boston Marathon when the bombs went off.

After completing the 26.2 mile race, trauma surgeon Dr. David King found the energy to operate on victims of the 2013 Boston Marathon bombings.

Boston Massacre

Trace the journey of Boston's Irish population from poverty to power, spearheaded by one man's determination to see justice for his community, in this bonus scene from "America: Promised Land."

In 1771, a group of colonists protest thirteen years of increasing British oppression, by attacking merchant ships in Boston Harbor. In retaliation, the British close the port, and inflict even harsher penalties.

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