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Houston, Texas
The bottom tip of Brownsville, Texas is literally on the border.
The southernmost point in Florida is slightly further south than the southernmost point in Texas. Brownsville TX is at latitude 25.90; Key West FL is at latitude 24.55. (One degree of latitude is about 69 miles; there's a bit of Texas that dips down even below Brownsville, but only by about 10 miles, nowhere near the 100 miles that would be required to put it south of Key West).
Texas; it's bigger, and extends farther.
Brownsville and Laredo
Texas
San Diego
South Texas is a big place. Figure 29 hours from Brownsville.
Austin, Texas
Texas at Southern border
Florida.
The soouthern tip of Brownsville in Texas is further south than the tip of Key West in Florida