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  START OF PERIOD 1
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  The events of Columbus and Vasco de Gama sailing to the New World and India.
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  The events involving Spain and their attempts to increase their influence in the Americas
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  PERIOD 1 ENDED with the founding of Jamestown Colony
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  PERIOD 2 STARTED with the Starving Time
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  The Salem witch trials and the glorious revolution signify the end of the 1600s
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  PERIOD 2 ENDS with George Washington's note
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  START OF PERIOD 3 with the abandonment of Fort Duquesne
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  The century and PERIOD 3 ended in 1800 with the election of Thomas Jefferson.