DOMA violates basic due process and equal protection principles applicable to the Federal Government.

from The Supreme Court of the United States – Syllabus, United States v. Windsor on Rap Genius

Meaning

The core provision of DOMA required the federal government to treat the marriages of same-sex couples one way (as though they had never happened) and the marriages of straight couples a different way (respecting their validity in 1,138 federal contexts). The Supreme Court struck down DOMA both because of that unequal treatment and because the federal government had improperly taken over the states' normal role of deciding who is married and who isn’t.

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