For which of the following reasons did Stephen F Austin need a new contract to establish a colony

Explanation:

Austin's Colony was the first legal settlement of North American families in Mexican-owned Texas. 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. This colonial period that brought Anglo and African settlers from the United States into contact with the governmental and ranching traditions of Spain and Mexico helped set the course for much of Texas' history in the 19th century and was only overshadowed later by the discovery of oil in Texas in the 20th century.

oil! is what i am assuming