Which U.S. state is known for the Gateway Arch?

Missouri is well-known for the Gateway Arch, which is an iconic symbol located in St. Louis. The Gateway Arch, completed in 1965, stands at 630 feet and is recognized as the tallest monument in the United States. It was designed to commemorate the westward expansion of the United States and serves as a gateway to the western frontier. The arch is part of the Jefferson National Expansion Memorial, which honors Thomas Jefferson's role in the Louisiana Purchase and symbolizes the spirit of exploration and opportunity associated with that era.

The other states listed may have their own notable landmarks and attractions, but none of them are associated with the Gateway Arch, which is distinctly tied to Missouri and especially the city of St. Louis. This emphasizes the unique identity that the Gateway Arch has as a representation of Missouri's history and culture.