Final answer:
Stephen F. Austin, Green DeWitt, Martin de Leon, and other empresarios made a significant contribution to Texas history by leading waves of American settlers into Texas and promoting colonization of the region.
Step-by-step explanation:
Stephen F. Austin, Green DeWitt, Martin de Leon, and other empresarios made a significant contribution to Texas history by leading waves of American settlers into Texas and promoting colonization of the region. These empresarios were granted land and were responsible for recruiting and settling settlers in Texas. Their efforts played a crucial role in the Americanization of Texas and the eventual push for Texas independence from Mexico.