The Supreme Court unanimously shot down Mexico’s attempt to sue U.S. gun manufacturers for weapons that have flooded south over the border, ruling that a federal law protecting gun makers from lawsuits over misuse of their weapons holds firm. Here’s what you need to know about the landmark gun industry decision:

The Supreme Court ruling

Justices unanimously sided with gun manufacturers:

Mexico’s $10 billion lawsuit

Government accused American companies of helping cartels:

The legal standard

Court explained why Mexico’s case failed:

The federal protection law

Protection of Lawful Commerce in Arms Act at center of case:

The concurring opinions

Two justices wrote additional reasoning:

The legal journey

Case traveled through multiple court levels:

The companies involved

Major gun manufacturers named in lawsuit:

The broader context

Gun trafficking remains significant cross-border issue:

Read more:

• Supreme Court blocks Mexico’s suit against U.S. gunmakers

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