The First Circuit is one of the thirteen federal appellate courts in the United States. It covers the states of Maine, New Hampshire, Massachusetts, Rhode Island, and Puerto Rico. The court hears appeals from federal district courts within its jurisdiction, reviewing decisions on various legal issues. Established in 1891, the First Circuit is headquartered in Boston, Massachusetts. It plays a crucial role in interpreting federal law and ensuring uniformity in legal standards across its region. The court's decisions can significantly impact the law and influence other circuits and lower courts.