Final answer:
Stephen F. Austin led the first European settlement in Texas, Cabeza de Vaca explored and reported on Texas, La Salle represented France in his expedition to Texas, and the first successful European settlement was established in 1821.
Step-by-step explanation:
a) The first European settlement in Texas was led by Stephen F. Austin, who brought the first 300 families into Texas.
b) Cabeza de Vaca is known for exploring Texas and giving an account of his experiences.
c) La Salle's expedition to Texas represented France.
d) The first successful European settlement in Texas was established by Stephen F. Austin in 1821.