Westward Bound – Illinois, Indiana, Missouri, and Ohio United States Census Bureau | An official website of the United States Government An official website of the United States government Here’s how you know Here’s how you know Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock ( Lock A locked padloc Topics: Population change Westward expansion. Topics: Population change Westward expansion.