The breeding range of the Red-shouldered Hawk (Buteo lineatus) spans eastern North America and along the coast of California and northern to northeastern-central Mexico.
There are five subspecies of the Red-shouldered Hawk.
The one occurring in South Texas is Buteo lineatus texanus.

1st & 2nd photo: A adult
3rd & 4th photo: A juvenile, evidenced by the brown streaks on its chest.

Brazos Bend State Park, Texas, USA, 2 March 2009