Board Thread:Timeline Discussions/@comment-5678709-20130214232141/@comment-32656-20130215122217

Dynasties, no way. The rest... not impossible.

By some accounts, Washington was offered a crown, and turned it down. Some of the other colonists tried to get the Stuarts, and members of several other royal houses, to be named to the role to.

Basically, have Washington agree to it, or the other royals agree, and then get approved by the majority (highly, highly, unlikely), and you have a monarchy. Noble houses more like in Europe would arise to some degree, though I'd argue that that in fact was the case otl anyways, without the fancy titles.