Arizona v. United States
2012 United States Supreme Court case

Arizona v. United States, 567 U.S. 387 (2012), was a United States Supreme Court case involving Arizona's SB 1070, a state law intended to increase the powers of local law enforcement that wished to enforce federal immigration laws. The issue is whether the law usurps the federal government's authority to regulate immigration laws and enforcement. The Court ruled that sections 3, 5(C), and 6 of S. B. 1070 were preempted by federal law but left other parts of the law intact, including a provision that allowed law enforcement to investigate a person's immigration status.
Background
On April 23, 2010, Arizona Governor Jan Brewer signed into law SB 1070, which supporters dubbed the "Support Our Law Enforcement and Safe Neighborhoods Act". It made it a state misdemeanor for an illegal immigrant to be in Arizona without carrying registration documents required by federal law; authorized state and local law enforcement of federal immigration laws; and penalized those found to be knowingly sheltering, hiring, and transporting illegal immigrants.
The bill's passage immediately sparked constitutional concerns over potential civil rights violations and encouraging of racial profiling. Tens of thousands of people demonstrated against the law in over 70 U.S. cities on May 1, 2010 (International Workers' Day). A rally in Los Angeles, attended by Cardinal Roger Mahony of the Roman Catholic Church, attracted between 50,000 and 60,000 people, with protesters waving Mexican flags and chanting "Sí se puede." The city had become the national center of protests against the Arizona law. Around 25,000 people were at a protest in Dallas, and more than 5,000 were in Chicago and Milwaukee.
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