Pleasant Grove City v. Summum
Pleasant Grove City v. Summum, 555 U.S. 460 (2009), is a decision from the Supreme Court of the United States which ruled on the U.S. Constitution's prohibition on a government establishment of religion specifically with respect to monuments (e.g., statues) on public land.
Source: Wikipedia — Pleasant Grove City v. Summum (CC BY-SA 4.0)