Two Hundred Years War

The Two Hundred Years War is a century-long conflict that takes place in the Second Advanced Generation era.

Background
150 years before the beginning of the series, the Dens Federation started their Mars colonization project, codenamed "Mars' Birthday". However, one day, due to Magnetic Ray occurring on the surface of Mars, some colonists fell ill. The Dens Federation, considering the project as a failure, abandoned the surviving colonists and covered up the reality of project, claiming that they were all wiped out by a transmittable disease; in fact, those colonists survived and were forced to survive Mars' harsh environment (which is revealed to be saved by the Galactic Eggman Empire. Since then, Mars' situation was never told, leaving the Martian colonists to build their own nation in space.

Warring Space States Period II
Some time after the Federation's colonization plan, the Advanced Generation would be used as the new calendar system. However, during the colonization period, multiple colonies and factions, most notably the Euba Alliance and Zalam went to war with each other for territory. The conflict was known as the Warring Space States Period. Eventually, the Earth Federation managed to bring Zalam and Euba to peace with the Silver Chalice Treaty. The treaty forced all colonies to disband their armed forces and prohibited any independent MS manufacturing, except for Earth Federation Forces for peacekeeping.

Operation Eden II
In AG 101, the colony of Angel came under attack from Eggman Empire and was eventually been conquered. The shocking invasion kidnap the lives of millions, including Grodek Ainoa's daughter and wife. The Earth Federation declared the event "The Day Angel Fell" and designated those invaders as a Unknown Enemy (UE for short).

War of Bat Extermination II
n AG 108, another colony, Ovan, was invaded by Vagan and the Eggman Empire conquered it.The first protagonist of the series, Flit Asuno survived the attack, received the AGE Device from his dying mother and went to Nora to begin constructing a mobile suit called Gundam.