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| threats on the frontier | ||
| a plant that lead thousands of Americans to the West because it was ideal for grazing | ||
| a system where Eastern merchants would trade with Western trappers for fur | ||
| Man who pushed for national parks | ||
| First national park | ||
| Things promoted by the national literature | ||
| Three Western countries ahead of America in population | ||
| reasons for immigration | ||
| German contributions to culture | ||
| German-promoted ideals | ||
| Inventor of the cotton gin | ||
| inventor of the sewing machine | ||
| Inventor of the foot treadle | ||
| Supreme court decision that ruled that unions were legal provided the practices did not hurt others, but still outlawed strikes. | ||
| inventor of the steel plow | ||
| invention of the mechanical mower-reaper | ||
| main national road | ||
| Road that lead across Pennsylvania, allowing economic expansion to expand westward | ||
| perfected the steamboat | ||
| shortened time and cost of transportation, created new towns and cities | ||
| most significant contribution to America's economy | ||
| Inventor of the air brake | ||
| laid first transcontinental telegraph cable |
