Milwaukee has always been a big bowling area. As has most of the great lakes states. Michigan in particular has always been the state with the most certified (sanctioned) bowlers. Metro Detroit USBC has always been the largest assn. and still is. Texas probably benefited from a lot of northerners moving there.
Now to your question. Texas is hot and has an awful lot of people. The north has a lot of cold weather and it lasts a long time every year.
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