This country was formed by the northeastern Mexican states of Coahuila, Nuevo León, and Tamaulipas.

The flag was no longer used following the defeat of the Republic of the Rio Grande by Mexican troops.

[2][1][3][4] The three stars represent the three states that seceded: Coahuila, Nuevo León, and Tamaulipas.

[5][6] The fly is split into three bands, one white, one red, and one black.

[10] The city of Weslaco, Texas uses the black stripe variant on display with the aforementioned six flags of Texas in their city museum.