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1492 BCE
Columbus' 1st voyage (1492)
on Wikipedia it states "Between 1492 and 1503, Columbus completed four round-trip voyages between Spain and the Americas, each voyage being sponsored by the Crown of Castile.
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The year Jamestown was settled
on http://www.americaslibrary.gov/jb/colonial/jb_colonial_jamestwn_1.html , they state "They established Jamestown, Virginia, on May 14, 1607, the first permanent British settlement in North America."