Just downloaded elite units of the West and America

[The Fool on The Hill]

Which units should I use for Multi while playing as the U.S?

[TheEschaton]

I say long riflemen are good in moderation, as are your minutemen (cheap line!). Just make sure to support the minutemen with some guards. Also Marines are devastating, and legion of the US can be very nice for breaking up enemy skirmishers. Top it all off with Mounted Pioneers for the cheapest dismountable cavalry in the game and a decent selection of cavalry, and you have yourself a very respectable army. Alot of people like to use America with a healthy dose of line infantry, but I think this doesn't play to the faction's strengths.