Germany
of small nations, the strongest nation, Prussia, was a strong European power
throughout the 18th and 19th centuries. Although the Prussians didn't get
involved in colonization, the fact alone that they represent all Germans
nations in AoE3 shows that they weren't included to be realistic. Many
Hessians, a German faction, were hired by the British to fight for them during
the American Revolution.
the Discovery Age, they get free Uhlan cavalry, 1 for every Age they advanced
(2 for Colonial, 3 for Fortress, 4 for Industrial). They also have the option of
shipping over a Settler Wagon, a powerful and productive villager. It's also
much easier to hire Mercenaries.
Settler Wagon (unique settler), Uhlan (heavy cavalry), War Wagon (heavy ranged
cavalry)