The Southwest and Southeast are the warmest regions in the US. However, out of the four regions defined by the census bureau, the West and South would have to be the warmest.
There are many regions in the US, not just two. For example the Northeast and the Southeast.
Costa del Sol and Costa Blanca
It is warmest in the southwestern deserts and Hawaii, especially during summer months.
The Pacific
South and West
The regions of the Southern US (16) and the Western US (13) have the most combined states: 29.
Appalachian and Rocky Mountains.
The best safest and warmest city in the US is the city of Scottsdale, Arizona. In second place is the city of Plano, Texas.
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The two largest land form regions in the US are the Rocky Mountains and the Appalachian Mountains. In Canada, the largest land form region is called the Maritime terrains.
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Hawaii