How did the border dispute between Mexico and Texas affect the Mexican on war

Struggle with Mexico started when the US added Texas as a state in 1845. Mexico asserted that the new boundary among Texas and Mexico was the Nueces Waterway, while the US challenged the line was the Rio Grande. Battling started when a unit of U.S. mounted force was assaulted close to the Rio Grande.

i would say your answer would be the second option.

hope this !

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done.