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Factbox: Last US Gun Control Legislation

Participants hold up signs as students and gun control advocates hold the "March for Our Lives" demanding gun control after recent school shootings at a rally in Washington, 2018.

The last time the U.S. government passed a gun control bill was 25 years ago.

The bill: Federal Assault Weapons Ban

Year passed: 1994

Provisions: It banned the manufacture, transfer or possession of "semiautomatic assault weapons," defined as military-style assault weapons, including the AR-15.

Effect: A recent study found mass shooting fatalities were 70% less likely to occur while the ban was in place.

Expiration: The ban expired in 2004, as was stipulated in the legislation.

Reintroduction: Several attempts were made to re-enact the ban, including after the 2013 Sandy Hook Elementary School shooting, which killed 26 people, including 20 children. It was never was renewed.