Six Mexican frigates before the Mexican-American War

How would Mexico acquiring six frigates in 1830 have changed the Mexican-American War?

Their effect would depend on which coast received them: Caribbean basing changes little, while Pacific basing could seriously complicate US coastal operations because no Panama Canal existed to shift forces quickly.

Six Mexican frigates could create different problems depending on which coast received them. The answer expects Caribbean basing to leave the US Navy in a relatively comfortable position. On the Pacific coast, the ships could raid northward before a response arrived. No Panama Canal existed to make movement between the two coasts straightforward. The premise therefore requires a basing decision before its effect on the 1846 war can be assessed.