The Eureka Rebellion at Ballarat causes the Victorian parliament to pass the Electoral Act to enable male suffrage (as in OTL). The English Colonial office sees this as an upstart colony of bandits and criminals (Transportation to Victoria only ended 4 years previously) and chose to dissolve the Victorian parliament for having ideas above its station. The Victorian public rebelled against the dictatorial Colonial office, who did not want Australia to go the same way as Canada seemed to be going (Canadian Act of Union 1840 effectively created the Canada that would become the confederation 17 years later). The English colonial office sent in the troops (mostly Scots and Irish troops) who were inspired to switch allegiance by the impassioned rhetoric from the rebellions' leaders, and in particular Irish-born Peter Lalor, future First Minister. The English had no choice - they had to concede Victoria and granted full dominion status and full self government. The other colonies then began to follow the fight for self government and, one by one, each of the colonies would join with Victoria (with the exception of Western Australia which remained a crown colony and was renamed Auralia to removed any thoughts of a "Complete Australia") forming the United Provinces of Australia, or simply Australia in 1857 (Tradition holds that the UPA started with that first act of rebellion in 1854). Auralia remained a crown colony until 1933, when they voted to joined the UPA.
The Flag comes from the original Eureka Rebellion flag first flown in Ballarat, but includes the national colours of Green for the fertile coast land and Gold for the Golden Wattle. The "CC" was added to commemorate the 200th Anniversary of the Eureka Rebellion.
The stars follow a loose representation of the Southern Cross and each have eight points for each Province: Victoria, New South Wales, Fitzrovia (OTL QL), Tasmania, Northern Province (OTL NT), Auralia (OTL WA), Adelaide Province (OTL SA), and Centralia (OTL former southern half of NT).