CBS News poll: 25 years after 9/11, most see a changed country and some success fighting terrorism

TL;DR

Most Americans view the 9/11 attacks as a defining, country-changing event that needs to be remembered.
A majority feel there is less unity in the U.S. now compared to the time of the attacks.
The "war on terrorism" launched after 9/11 is seen by most as at least somewhat successful, though unease persists.
Many younger adults who do not personally remember 9/11 still recognize it as a consequential event.
About a quarter of Americans have visited a 9/11 memorial or museum.
Opinions on U.S. preparedness for a terrorist attack are divided, with partisanship playing a role.
Compared to the time of the attacks, Americans perceive more security but less privacy and less unity.
Public support for military action against those responsible for 9/11 was near-universal in 2001, a level of unity rarely seen today.

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