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Lightning and humans burned the understory of longleaf pine every 1 to 15 years from Archaic periods until widespread fire suppression practices were adopted in the 1930s. Burning to manage wildlife habitat did continue and was a common practice by 1950.
Neltuma laevigata mesquite near the Chichimeco dam, in Jesús María, Aguascalientes, Mexico. Mesquite is a common name for some plants in the genera Neltuma and Strombocarpa, which contain over 50 species of spiny, deep-rooted leguminous shrubs and small trees. They are native to dry areas in the Americas.
Map of wood-filled areas in the United States, c. 2000 [1]. In the United States, the forest cover by state and territory is estimated from tree-attributes using the basic statistics reported by the Forest Inventory and Analysis (FIA) program of the Forest Service. [2]
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It has been estimated that before European settlement, forests in the United States mainland covered nearly 1 billion acres (4,000,000 km 2). [1] Since the mid-1600s, about 300 million acres (1,200,000 km 2) of forest have been cleared, primarily for agriculture during the 19th century.
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Of all the United States, southeastern flora has been least changed in composition during the last 20,000 years. During the Last Glacial Maximum about 18,000 years ago, when the glacial front extended south to the approximate location of the Ohio River, preexisting natural