Hunter v. Pittsburgh, 207 U.S. 161 (1907), is a landmark case that confirmed the supreme sovereignty of a state over its municipalities.

The election was allowed to continue, and a majority of all voters in the two cities combined voted for joining.

Plaintiffs appealed under the United States Constitution's Contract Clause (Article 1, Section 10, Paragraph 1) and the Due Process Clause of the Fourteenth Amendment.

The United States Supreme Court unanimously ruled that the Pennsylvania law violated neither Article I nor the Fourteenth Amendment of the Constitution.

Some important lines from the opinion concerning the supremacy of states over the municipalities include the following: