The McFlys had arrived in America in the late 1800s with Seamus McFly, his brother Martin McFly, and his wife Maggie McFly heading for the west coast. After Martin was stabbed to death in Virginia City, Nevada, Seamus and Maggie moved on and settled in Hill Valley, California. In 1885, Maggie gave birth to her first son William Sean McFly, the first McFly born in America. From there, the McFlys would create a large family that was notable to make A History of Hill Valley, 1850-1930. Over the next century, the family continued to reside in Hill Valley, albeit under control of Biff Tannen. Marty McFly would make the greatest contribution to his family's history by going back in time and inadvertently changing events. Marty's continued actions would benefit him and his family into the future,