The U.S. marks the 25th anniversary of 9/11. Events will honor those lost, at a time when Americans are divided about the meaning and legacy of the terrorist attacks.

After 25 years, 100 million Americans have no memory of the day that changed everything. In an age of social media, disinformation and mistrust, that can be dangerous.

As the 25th anniversary of the September 11 attacks approaches, we want to hear from readers about where you were and what you remember of that historic moment in 2001