McAllen adopted a home rule charter in 1927. Canning factories, a winery, tortilla plants, wood-working plants, and some oil exploration increased the population to 9,074 by 1930. In 1936 Hiram Garner opened the Valley Distillery, Incorporated, which produced wines from citrus juices. The town was a petroleum and farm chemurgic center with a population of 11,877 in 1940, by which time it had adopted the nickname “The City of Palms”. In 1941, a suspension bridge replaced the old bridge from Hidalgo to Reynosa in Tamaulipas; the new toll bridge was purchased by McAllen and was named the McAllen–Hidalgo–Reynosa International Bridge. Its construction resulted in increased tourist trade, making McAllen a winter resort and port of entry to Mexico. The discovery of oil in the Reynosa area in 1947 resulted in a large migration of people from the Mexican interior, constituting a new tourist market and cheap labor supply for McAllen. The sister cities were linked as a result of the increased traffic between them. The population of McAllen was 20,005 in 1950 and 32,728 in 1960. By the 1950’s and 60’s, McAllen had grown into an important hub for international trade with Mexico, a retail shoppers’ mecca, and a highly desirable destination for snowbirds, or, as they are affectionately called locally, “Winter Texans.” The McAllen–Hidalgo–Reynosa International Bridge was the number-two port of entry into Mexico in 1954. Source: https://visitmcallen.com/about-us/history/ as well as the McAllen Police Department.