Final answer:
Stephen F. Austin brought 300 families from the United States to Texas in 1821, earning him the title Father of Texas and contributing significantly to the demographic and political changes that led to the Texas Revolution.
Step-by-step explanation:
Stephen F. Austin is known as the Father of Texas for bringing 300 families from the United States into Texas. In 1821, influenced by the policies of the newly independent country of Mexico that desired to populate the sparsely inhabited region of Texas, Austin led these families to settle in the Mexican province. This movement of American settlers led to significant demographic changes, and by 1827, the American population outnumbered the Mexican residents. Such settlements played a crucial role in the cultural dynamics, economic aspects, and political tensions that ultimately led to the Texas Revolution and the formation of the Republic of Texas, also known as the Lone Star Republic.