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Geographical Obstacles
Natural features hindering westward settlement.
Land Forms
Plains, basins, and canyons affecting travel.
Climate Challenges
Extreme heat, cold, and drought conditions.
Waterway Limitations
Lack of navigable rivers for transport.
Transcontinental Railroad Hardships
Difficulties faced during railroad construction.
Mining Techniques
Methods adapted for extracting minerals from rock.
Comstock Silver
Silver embedded in quartz requiring heavy machinery.