From the record
“The Roma Historic District in Roma, Texas preserves an intact example of a border town in the lower Rio Grande valley. The town was an important port and transshipment point on the Rio Grande from 1829 to the 1880s.”
Wikipedia article Roma Historic District, CC BY-SA 4.0.
One of 9 National Register listings published here for Starr County · listed in 1972 · category: District · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service