On Christmas eve, when father sees how upset the family is at the idea of moving to New York City, he changes his mind and announces that they will stay right there in St. Louis. Suddenly, Warren Sheffield (Robert Sully) rushes in the front door, professes his love for Rose, says that they're going to get married, then rushes back out again. Winter passes and spring arrives. Everyone is dolled up in their finest clothes and waiting on the front porch for two carriages to arrive. Rose, Esther, Warren, and John Truett (Tom Drake) get in one; Father, Mother, Grandpa, Agnes, and Tootie get in the other. When asked where they want to go, Tootie replies, 'To the Louisiana Purchase Exposition.' In the final scene, the Smith family is trying to figure out where to eat, when the lights of the exposition are turned on. The family marvels at how a wonderful thing like the World Fair could take place right in their own hometown.