Michelle Clifford, her husband and children.Courtesy of Michelle CliffordCalifornia native Michelle Clifford is moving to Celina, Texas — America's fastest-growing city.Celina is attracting movers with its affordability, many newly built homes, and small-town vibe.Clifford, 33, said she and her family hope the city can preserve its charm as it grows.This as-told-to essay is based on a conversation with Michelle Clifford, a 33-year-old sales manager from California who is moving to Celina, Texas, in July.