The Great Martian War Series by Scott Washburn

Following the defeat of the Martian invasion of Britain, a new threat to humanity lands in the American west. President Roosevelt musters the captains of industry and leading scientists to find a way to turn back the Martian tide

The second book in the Great Martian WarFollowing the initial success in the great plains, United States forces face threats along the Mississippi River from a Martian counterattack.  Roosevelt calls in world leaders to help the US in their fight against the Martians, in this follow-up to War of the Worlds.