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In 1900 The Lacey Act is set to regulate imported species.
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The Brown tree snake was introduced into Guam in 1950.
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The snake was first sighted from the seaport and became conspicuous throughout central Guam by the 1960.
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By 1968, the Brown Tree Snake had successfully dispersed throughout the island.
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since 1993, WS has conducted ongoing operations to reduce damage caused by The Brown Tree Snake.