[fortheDeclaration]

I see it saying that the boundary was not to extend beyond the rio grande.

That appears to be setting its limits.

Many times,boundaries after wars are very fluid.

I am not saying the Mexicans were right, but that there was reason for questioning on what happened and why.

[GOPcapitalist]

I see it saying that the boundary was not to extend beyond the rio grande. That appears to be setting its limits.

Yeah. As in setting its limits at the Rio Grande. If my border does not go beyond the Rio Grande that means the Rio Grande is where the extent of my country's lands cease.

Many times,boundaries after wars are very fluid.

They may have been in other cases but Texas' was not. They very specifically decided on the Rio Grande as the border and obtained recognition of their country extending to that border from the U.S. and all the major European countries. Mexico persisted in violating both it and marching its armies deep into Texas, as far north as San Antonio.

I am not saying the Mexicans were right, but that there was reason for questioning on what happened and why.

Not any legitimate one. Mexico was in violation of Texas' borders as it had been constantly doing for the previous decade since they reneged on the Treaty of Velasco and initiated efforts to reconquer Texas.