What is francis scott key and the battle of fort mchenry?

Francis Scott Key, a Washington lawyer who had come to Baltimore to negotiate the release of Dr. William Beanes, a civilian prisoner of war, witnessed the bombardment from a nearby truce ship. An oversized American flag had been sewn by Mary Pickersgill for $405.90 in anticipation of the British attack on the fort.

Explanation:

answer; conditional stimulus will trigger a conditioned response;