UFO Sightings Map:
South Central USA
On this map, sightings for all years seem concentrated along the US-85 (I-25)
corridor running North from El Paso, TX through New Mexico and Colorado.
1940s-1950s events (blue) cluster around Dallas, San Antonio and Levelland Texas, and New Mexico. 1960s-1970s sightings (violet) are more evenly distributed. Groups that do appear seem separate from the earlier blue ones.
Along the Gulf Coast, older sightings show in Texas, Louisiana and Mississippi, the most recent ones in green (1980s to present) predominate in the Alabama and Florida panhandles.
Notice how evenly dotted Mississippi is, then compare to the clustering elsewhere.