September 11
The phrase "and then everything changed" gets way over-used. Mostly by talking heads with no sense of historical scale. Things are always changing, but the 20th and 21st centuries have seen the /rate/ of those changes increase dramatically.
But what must NOT change is how in times of crisis and trouble, we set aside our differences, our distrust, and our fear, and come together to protect and defend one another.
The only way forward is together.