A revolution was coming and he was giving warnings about Texas.

Does the sentence below support what the sentence above is saying?

As one covers the distance from San Antonio de Bejar to this town he will note that Mexican influence decreases until on arriving in this place h will see that it is almost nothing.

No. I don't even see a connection.

Therefore, I am warning you to take timely measures Texas could throw the whole nation into revolution

Does this one support it better

Yes.

Yes, the sentence below does support what the sentence above is saying. The sentence states that as one travels from San Antonio de Bejar to another town, they will observe a decrease in Mexican influence until it becomes almost non-existent when they arrive at the mentioned place. This aligns with the idea of "warnings about Texas" in the previous sentence, suggesting that the revolution was linked to a diminishing Mexican influence in Texas.