In what way did Americans show their patriotism after 9/11

The honored the date where heroes would save many lives. These heroes were firefighters, policemen, etc.

Explanation:

911, the emergency number in USA (patriotism I see), is based on the date of September 11th, 2001.

The American citizens showed their gratitude and appreciation to the heroes who saved them and the people who died in that tragic accident. The world has lost some great people