Laredo ( ; ) is a city in and the county seat of Webb County, Texas, United States, on the north bank of the Rio Grande in South Texas, across from Nuevo Laredo, Tamaulipas, Mexico. Laredo has the distinction of flying seven flags (the Flag of the Republic of the Rio Grande, which is now the flag of the city, in addition to the Six Flags of Texas). Founded in 1755, Laredo grew from a village to the capital of the brief Republic of the Rio Grande to the largest inland port on the Mexican border. Laredo's economy is based on international trade with Mexico. Many major transportation companies have a facility in Laredo. The city is on the southern end of I-35, which makes it close to the manufacturers in northern Mexico. It has four international bridges and one railway bridge.