The United Commonwealth of North America, more frequently called the United Commonwealth or the Commonwealth is a union of states and provinces of former East Canada and the United States. It formed in 2099 on April 1st on the Act 2099 after The remaining US and Canada's economy began to collapse. The Partition of the United States happened after a Slavic Union victory of WWIII which was succeeded by The North American Civil War. The US maintained its existence on the great plains to east coast.