Data cleaning and analysis for county urban-rural mirgation data under the guidance of Dr. Pretnar

Data sources:

1. USDA Atlas dataset
   https://www.ers.usda.gov/data-products/atlas-of-rural-and-small-town-america/download-the-data/
2. US Census Bureau, Cartographic Boundary Files
   https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html

Example output preview: