“...the Declaration of Independence ....”
This was NOT an academic document! I am not sure the idea of plagiarism even applies. Locke wrote his literary works with the idea that they might be used and applied. Seems to me Jefferson was doing exactly what Locke wanted to see happen. You could also “argue” in some sense that Locke stole from numerous other philosophers probably going back to Plato.
Tell that to Richard Henry Lee. He outright accused Thomas Jefferson of plagiarism when he did the Declaration of Independence, and not only did TJ not deny it, he even implied that was its strongest reason for promoting its values. Don’t believe me? Here’s some sources:
*https://mises.org/library/real-jefferson
*https://www.libertarianism.org/publications/essays/excursions/was-thomas-jefferson-plagiarist