Our official state flag of Texas, the Lone Star Flag, was adopted in 1845 when Texas became the 28th state of the United States of America.
The colors represent:
Bravery - red,
Purity - white,
and Loyalty - blue.
The large white star was first used on Texas flags in the 1830's during the battles between Texas and Mexico.
If you would like to read more about the flags that have flown over Texas thru the years -
this is an excellent site ... FLAGS OF THE REPUBLIC OF TEXAS