Final answer:
The blending of adobe and Spanish architecture is the best example of the mixed cultural and national heritage of the Southwest.
Step-by-step explanation:
The best example of the mixed cultural and national heritage of the Southwest is the blending of adobe and Spanish architecture. Adobe was a building material used by the Native Americans, while Spanish architecture was introduced by the Spanish colonizers. The combination of these two influences is evident in the traditional structures found in the Southwest.
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