This is my official request for Mexican American War US Infantry Marching. I believe there is enough in the Napoleonics line as is to field a respectable Mexican force for the time being. I believe you could fight most battles with the first two models using some Napoleonic generals and artillary to flesh out the American force as well.
1.) US Infantry
2.) US Dragoons Mounted
3.) US Artillery Men
4.) Command
5.) Militia (Mississippi Rifles)
6.) Texas Rangers (Mounted and skirmishers)
7.) US Horse Artillery
The period may not be popular enough to make all figs, however a complete battle could be fought with the first two and Napoleonic range figs for fill in. I will champion this cause to The Halls of Montezuma and the Shores of Tripoli. Hip, Hip....
Cheers, I've made a note of this, and I'll keep an eye on any other votes.