Simplify the following text for a Grade 12 native English-speaking person.
Original: However , after a series of successful operations against frontier settlements â `` led by the Mohawk war chief Joseph Brant , other war chiefs , and British allies â `` the future United States reacted with vengeance .
Simplified: However , after a series of successful operations against frontier settlements â `` led by the Mohawk war chief Joseph Brant , other war chiefs , and British allies â `` the future United States wanted revenge .