This is book 6 of Gilbert Morris' Historical Fiction series, "House of Winslow", which follows one family's line down through America's history, starting with the first pilgrims. Each book can stand alone or be read as part of the series. Though the books are filled with rich, accurate historical detail, they are great recreational reading and have fun plots with a touch of wholesome romance. Check my list for more in this series.
"When Nathan Winslow fought to keep the hopes of the Continental Army alive at Valley Forge, he never dreamed that a rich and powerful nation would blossom from those thirteen struggleing colonies. Nor did he forsee the consequences that the expanding nation would have on his own family. Now, years after the American Revolution, Nathan's two sons, Christmas and Knox, race west--Knox hoping to be among the first to set up trading posts in Missouri, and Christmas will journey toward what some considered to be the ultimate test, but in so doin, he will leave an indelible mark on the family tree. Will he be cut off from the one Treasure he ever wanted?" "Guideposts Edition"