7. Percentage of U.S. households with guns is falling

The percentage of U.S. households with guns has been trending downward for years. However, gun-owning households have more firearms than they used to — 8 on average vs 4 in 1994 — so the number of guns in the U.S. has actually gone up, per the Washington Post's analysis of multiple polls.

Data: NORC at the University of Chicago; Chart: Andrew Witherspoon / Axios