Final answer:
Stephen F. Austin led American farmers into Tejas (Texas) to establish a colony, under the encouragement of the Mexican government after Mexico's independence from Spain in 1821.
Step-by-step explanation:
The individual who led many American farmers into the Mexican land called Tejas (Texas) to establish a colony there was Stephen F. Austin. In 1821, following the death of his father, Austin took over his father's grant to bring 300 families into Texas. This colonization was encouraged by Mexico's government after the country gained independence from Spain. Mexico sought to populate the area and passed laws to stimulate immigration. Stephen F. Austin's efforts and the subsequent influx of Americans into Texas led to significant demographic changes, where the American settlers quickly came to outnumber the Mexican residents known as Tejanos. The mostly agrarian American settlers were also motivated by the expansion of slavery and the cultivation of cotton.