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English colonists plant grain, potatoes, pumpkins and melons -
Indians teach Jamestown settlers how to grow corn -
George Washington breeds the first mules in the US -
Louisiana Purchase, a port for American farmers -
John Deere manufactures steel plow -
Sir John Laws founded the commercial fertilizer industry by developing a process for making superphosphate fertilizer -
Mason jars used for home canning -
Pasteurization invented - by Louis Pasteur -
Refrigerated railroad car patented -
Transcontinental railroad complete