Answer:
The title Old 300 refers to the settlers who received land grants as part of Stephen F. Austin's first colonial contract in Mexican Texas. These families had come from the Trans-Appalachian South and were virtually all of British ancestry, many of whom already had substantial means before their arrival.
Step-by-step explanation:
Stephen F. Austin
Led by the Empressario, Stephen F. Austin, an initial grant for three hundred families--the "Old 300"--in 1821 opened up Texas to a flood of American immigrants, as many as 30,000 by the time of the Texas Revolution in 1835.