Hi there! The 1840s-50s are a period I've recently taken a big interest in, and yes it's a shame it doesn't get more attention either in reenacment or popular media like film. I only know of one film that's actually set during the Mexican-American War, "One Man's Hero", about the Irish soldiers of the St. Patrick's Battaltion who fought for Mexico. And then there's "The Alamo" with Dennis Quaid and Billy Bob Thornton, but that's 1830s.
If anyone knows of any good films set during the 1840s-50s, I'd love to hear recommendations. Doesn't even have to be set in America, I'd welcome a look into life in places like Britain/Europe during the same period.
Similarly, are there any good books folks could recommend on firearms of that era? In particular I'd be interested in single-shot and pepperbox handguns of the 1840s-50s.