The United States of Vinland: The Landing (The Markland Trilogy) by Colin Taber

What if?

What if the descendants of the Vikings who settled Greenland and went on to reach North America around the end of the first millennium had stayed?

Five hundred years later, would Christopher Columbus have arrived to the south of an eastern seaboard dotted with centuries old settlements and towns hosting devotees to Thor and Odin?

Might the Norse have gone on to build a nation as dominant as the United States of our own world?