Examlex
Summarize the main technological and social innovations of agricultural societies.
Conservation
The practice of protecting the natural environment and preserving natural resources from loss, degradation, or waste.
Frontier
The edge of a settled area, or the boundary between the known and unknown, often associated with westward expansion in American history.
Railroads
Systems of tracks along which trains run, a major form of transportation for both goods and passengers, historically significant in the development and expansion of countries.
Development
The process of economic growth, expansion, or realization of social and cultural potential within a country or region.
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