Why do we call someone who does things differently a “maverick”?

In the nineteenth century, Samuel A. Maverick was a stubborn Texas rancher who, because he said it was cruel, refused to brand his cattle even though it was the only way to identify who owned free-range livestock.

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Instead he would round up all the unbranded cattle he could find, even those not from his own herd. At first any stray unbranded cow was called a “maverick,” but the word has grown to mean anyone Who doesn’t play by the rules.