The Chinese colonized New Earth first.  Through their colony of Xin Xiang (New Town) the Chinese claimed the world as their own.  We disagreed with their claim and founded Landing City.  For the next two centuries, Landing City and Xin Xiang vied for control of the world through a series of territorial claims and outposts surrounding each colony.  Despite often tense relations though, they avoided armed conflict.  Both cities remain to this day.