1839 U.S. Supreme Court case

The 1839 U.S. Supreme Court case you're referring to is likely *Chisholm v. Georgia*. In this case, the Court ruled that citizens of one state could sue another state in federal court, challenging state laws or actions. This decision was significant because it challenged the traditional idea that states were sovereign and protected from such lawsuits. As a result, it led to the adoption of the 11th Amendment in 1795, which clarified that states cannot be sued in federal court by individuals from another state or country, reinforcing state sovereignty and limiting federal jurisdiction.