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8 Cards in this Set
- Front
- Back
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Transcontinental Railroad
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train tracks that linked the eastern US with the west
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Pony Express
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a mail route where people ride up to 75 miles per day to deliver mail quickly
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invention
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something made for the first time
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Morse Code
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a series of dashed and dots that represent letters and numbers
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broadcast
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to send out information over a wide area
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reaper
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a machine that cuts grain
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pasteurization
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a process to kill germs by heating a liquid to jsut below the boiling point
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vaccine
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a weak or dead form of a disease that is given to people to prevent them from getting a stronger form that will make them sick
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