Dallas is the third largest city in Texas and the ninth largest in the US. Dallas is part of what’s called the Dallas-Fort Worth Metroplex, the largest metro area in the South and fourth largest in the US. Dallas originally rose to prominence because of oil and cotton industry and its location along important railway lines in the late 1800’s. Today, the Dallas-Fort Worth (DFW) area has a strong financial and industrial economy and also features one of the largest and busiest airports in the world, the Dallas/Fort Worth International Airport.