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Mathematics
History
Transportation and Infrastructure
All Subcategories (17)
Accessible infrastructure
Agricultural Transportation
Highway Policy
Impact of Railroads on Georgia's Economy
Impact of Railroads on the West
Impact on Environment
Impact on Government and Politics
Impact on Specific Industries
Impact on Urban Areas
Innovation in transportation
Inventions and Innovations
Railroad Industry
Railroads
Steamboat and Canal Systems
The opening of the Erie Canal
Transcontinental Railroad
Urban Development and Planning
Parent Categories (19)
Access to services
American History
Aztec technological advancements
Economic History
Economic Impact
Economics
Geography
Government and Politics
History
Industrial Revolution
Industrialization
Oklahoma History
Technological advancements
Technology
Technology and Industry
Technology and Innovation
U.S. History
United States
United States History