What does the American cowboy tradition owe to the contributions by the Mexican vaquero like Gregorio Cortez?

Clothing style

Explanation:

The American cowboy tradition owes to the contributions by the Mexican vaquero like Gregorio Cortez to CLOTHING STYLE.

This is evident in the wearing of low hats which was eventually turned to high crowned wide sombreros, bolero jackets, and sashes worn by American Cowboys.

Similarly, the clothing style is reflected in the wearing of boots and large troweled spurs by American Cowboys.

Hence, the correct answer is CLOTHING STYLE

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