Laredo is the county seat of Webb County, Texas, United States. Laredo's economy is based on international trade with Mexico. It is the largest inland port in the United States. Most major transportation companies have a facility in Laredo. Laredo's location along the southern end of I-35 close to the manufacturers in North Mexico promotes its vital role in trade between the United States and Mexico.Laredo has the distinction of flying seven flags (the Flag of the Republic of the Rio Grande in addition to the Six Flags of Texas). Founded in 1755, Laredo grew from a villa to the capital of the brief Republic of the Rio Grande to the largest inland port on the United States-Mexican Border. Today, it has four international bridges and one railway bridge. Laredo's weather is semi-arid during the summer and mild during the winter.Texas A&M International University and Laredo Community College call Laredo home. The biggest festival, Washington's Birthday Celebration is held during February all month long, attracting hundreds of thousands of tourists.