The main purpose of this legislative text is to update the boundaries of the Gateway Arch National Park in St. Louis, Missouri. This change aims to officially recognize an increase in the park's size and to reflect the current name of the park, which has been changed from the Jefferson National Expansion Memorial. Key provisions of this legislation include three main updates to the existing law. First, it changes the name from "the Jefferson National Expansion Memorial" to "Gateway Arch National Park." Second, it increases the park's designated area from 100 acres to 102.18 acres.