This legislation aims to establish a national commemorative focus on the United States-Mexican War (1846-1848) by co-designating the existing Arlington Memorial Bridge as the "United States-Mexican War Memorial." This recognition highlights the war's profound influence on American history and its role in shaping the nation's territorial contours, without affecting the bridge's primary functions. The bill authorizes the Secretary of the Interior, through the National Park Service, to administer this co-designation and conduct public observances. It also permits limited commemorative enhancements , including interpretive signage, plaques, and landscaping, at or immediately adjacent to the bridge to explain the war's causes, course, and consequences, including the Treaty of Guadalupe Hidalgo. These enhancements must adhere to historic preservation laws and will not materially alter the bridge's historic character or structural integrity. Importantly, all commemorative elements must be funded entirely through non-federal donations , with no federal funds allocated for their design, installation, or maintenance. The legislation explicitly states that the co-designation will not change the bridge's official name, impede its transportation functions, or modify existing maintenance responsibilities.