Louisiana Purchase
It wasn't as much who as it was what. The Louisiana Purchase urged Americans to settle around the Red River. Although Texas belonged to the Spanish, Thomas Jefferson declared the river a runoff to the Mississippi, thus making it neutral. I suppose if you need the name of actual persons, you would be looking for Moses and Stephen Austin. They brought patent holders into the state in their empressario.
Moses Austin
slaves
Well, you see that they brought their music food and language
He brought in 300 families/colonist into Texas.
they brought cattle to Texas
they brought farming
Thousands of Americans settled in Texas.
The British-Americans finished taking slavery into Texas when they crossed the Mississippi River and brought their slaves with them. Spain originally owned Texas and had some slaves, though it wasn't the normal until people crossed the river from the other southern states.
Cattle was first brought to Texas by explorers from Spain or the Spanish.
the spanish
He brought the first colony to Texas.
the americans