Before the wars began, the United Earth government was formed after Vers developed on Mars.
First Earth-Mars War
Vers would try to invade Earth and easily overpowered the Earth forces with advanced Aldnoah-powered Kataphrakts. However, the destruction of the Hypergate ended up damaging the Vers forces and gave Earth more leverage.
Second Earth-Mars War
For 15 years, relationships between the two planets were stable. One day the Princess of Vers Asseylum Vers Allusia would go out to Earth to establish peaceful relationships; however, this plan would backfire.