The United Americas was a country formed by the merging of North, Central and South America into one socioeconomic block. Created in 2104, the United Americas largely emerged as a response to the formation and growth of the Three World Empire, which was at the time pioneering space exploration and extra-planetary colonization. Aside from its terrestrial presence, the UA also oversaw several extra-planetary colonies, including that of Olympia on Luna.
The United States of America position as a starfaring, colonizing power has ensured it a leading role in the structure of the United Americas, as evidence from the name of the United States Colonial Marine Corps. The USCM is fully integrated into the joint command structure of the United Americas Allied Command and forms the major striking element of the UA forces.