Americans all come from somewhere. Their families may have roamed the continent for thousands of years before the Mayflower dropped anchor. They may have been on the ship. They may have come on later ones, freely or in chains. They may have come by truck, train or airplane. They came. And their journeys are reflected in the food they or their descendants eat. The Times asked 15 families from across the country to show us the holiday dishes they make that speak most eloquently about their heritage and traditions. The stories of these home cooks help tell the story of the nation, the story of who we are.