What made United States fight back?

I think Pearl Harbour made the USA fight back, because till then the American Home Front had been left,wasn't bombed or anything

What made the United States fight back ? there is one clear answer to that question - the Spirit of the American People.If History shows anything about America and its people its this- nobody hits the United States and remains imune from retaliation.Present day events, which are tomrrows history, illustrates this point clearly.