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Below were some of the effects caused by the changing environment of Maryland: Overhunting was responsible for the collapse of the fur trade by the middle 1600s The fossil pollen record reveals an explosion of ragweed pollen about 350 years ago that coincides with massive forest clearing and agricultural expansion following European colonization Colonial hunting and habitat destruction diminished the range of bear, elk, big cats, and woodland bison The passenger pigeon once the most common bird in Eastern North America - was hunted to extinction (the last bird died in captivity in 1914) Piedmont and mountain regions of Maryland once supported forests of giant chestnut trees that were decimated by a blight introduced in the 1920s
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