Parkdale grange hall. Parkdale is an unincorporated community in Hood River County, Oregon, United States. For statistical purposes, the United States Census Bureau has defined Parkdale as a census-designated place (CDP). The census definition of the area may not precisely correspond to local understanding of the area with the same name.
Westward Expansion summary: The story of the United States has always been one of westward expansion, beginning along the East Coast and continuing, often by leaps and bounds, until it reached the Pacificâwhat Theodore Roosevelt described as the great leap Westward..
The California Gold Rush was a major factor in expansion west of the Mississippi. That westward expansion was greatly aided by the completion of the Transcontinental Railroad in 1869, and passage of the Homestead Act in 1862.n less than a century, westward expansion stretched the United States from a handful of states along the Eastern Seaboard all the way to the Pacific. The acquisition of Hawaii and Alaska in the mid-19th century assured westward expansion would continue into the 20th century.