The first state to act after December's Sandy Hook shooting was New York, where Republicans control the Senate and Democrats the Assembly. Gov. Andrew Cuomo, a Democrat, worked with lawmakers of both parties to pass a sweeping bill that beefed up the state's ban on assault-style weapons and required universal background checks.
Other states have moved in the opposite direction, loosening restrictions on gun ownership and increasing the number of places where firearms are permitted. Many have Republican governors, a Republican-run statehouse or both.
In Michigan and Ohio, lawmakers have made it easier to obtain a gun. Arkansas, Maine and Mississippi have passed laws to protect the privacy of gun owners. Wyoming enacted legislation allowing judges to carry weapons in the courtroom, and South Dakota passed a law authorizing school employees to carry guns on the job.
More than a dozen other states are considering legislation that would enhance gun rights, including Texas, North Carolina, Missouri and Georgia.