If ITTL Harold defeats William at Hastings the political developments in the North will have major butterflies that will definitely affect Vinland (or whatever they decide to call it.)
Early on, France will be consumed with internal fights dealing with the succession in the Duchy of Normandy. The English will not have much to do with that, but may get involved first with consolidating things in England. Post 1100 or so, Harold's successor may get involved with Danish or Norwegian affairs. Let's say a series of wars like the OTL Brits had with France. This results in refugees fleeing first to Iceland and then to Vinland the Good.
By 1250 the population has grown to 10,000 to 20,000 folk, making the biggest settlement, perhaps by now calling itself a kingdom stronger than any single Indian tribe. The influx of settlers brings with it new diseases further weakening the mainland tribes. By now there are settlements as far south as OTL Virginia and the Vikings are aware of the Caribbean islands and trading with them.
Personally, I don't think slavery or serfdom will have much importance just yet. Slavery in the New World depended on mass production of commodity crops like sugar and tobacco, which won't be the case here. The native Americans had slaves, but mostly as prisoners from raids on other tribes.
As to governance, maybe a proto-democracy like the Icelandic Allthing takes root, where any freeborn male has the right to speak.
Early on, France will be consumed with internal fights dealing with the succession in the Duchy of Normandy. The English will not have much to do with that, but may get involved first with consolidating things in England. Post 1100 or so, Harold's successor may get involved with Danish or Norwegian affairs. Let's say a series of wars like the OTL Brits had with France. This results in refugees fleeing first to Iceland and then to Vinland the Good.
By 1250 the population has grown to 10,000 to 20,000 folk, making the biggest settlement, perhaps by now calling itself a kingdom stronger than any single Indian tribe. The influx of settlers brings with it new diseases further weakening the mainland tribes. By now there are settlements as far south as OTL Virginia and the Vikings are aware of the Caribbean islands and trading with them.
Personally, I don't think slavery or serfdom will have much importance just yet. Slavery in the New World depended on mass production of commodity crops like sugar and tobacco, which won't be the case here. The native Americans had slaves, but mostly as prisoners from raids on other tribes.
As to governance, maybe a proto-democracy like the Icelandic Allthing takes root, where any freeborn male has the right to speak.