Lexington and Concord

Lexington and Concord is where it all started. Although we may never know who fired the first shot, these boys ignited the fire of American independence. Just 30 minutes away from Lexington was Boston, where the men and women there were taught to act first, and initially find the solution second.
Hints
The answers are all "act first," so you should "initially find the solution second."
That word you discover is related to a thing that happened to Boston, but not during the Revolution. The focus of that event, which is related to acting first, is the answer.
Check your answer: