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Agriculture in the Southwestern United States
Agriculture in the Southwest United States is very important economically in that region. Much of the land, and most (85%) of the fresh water in the region is used on agriculture. Although there is not a significant amount of land in the Southwest that is used for growing crops, over 60 percent of the land is used as pasture for cattle and sheep.〔http://geochange.er.usgs.gov/sw/changes/anthropogenic/cropland/〕 The region gets less rainfall and is warmer than most other areas in the United States, so farming techniques have evolved to accommodate for a drier climate with less permeable soils. The Native Americans of the region had many different methods of farming, and grew many different crops than what is typically grown today in the Southwest by industrial farmers.
The Southwest United States is a region defined differently by different sources. The most broad definitions of the region include Arizona, California, Colorado, Nevada, New Mexico, Oklahoma, Texas and Utah. However, because this area covers a huge area of the United States with very different climates and cultures, the southwest is many times narrowed down to the Four Corner states, which are Arizona, Colorado, New Mexico, and Utah. However, California, Colorado, Oklahoma, Texas, and Utah have climates which are very different from what one might think the Southwest United States to be. Nevada, New Mexico, and Arizona have warm, dry climates which are contiguous on a very general level, but they also have many differences which allows for different types of agriculture.
==Watershed==
The three main watersheds of the southwest United States are the Colorado River Basin, the Great Basin, and the Rio Grande Basin. The Colorado River Basin includes parts of California, Utah, Arizona, New Mexico, Colorado, and Wyoming. The Colorado River is the largest river in the Southwest United States. The Great Basin watershed includes parts of southern California, most of Utah, the northwest half of Nevada, and parts of Oregon and Idaho. The Rio Grande Basin includes most of New Mexico, some of western Texas, and a small portion of Colorado.
Almost all of Arizona drains into the Colorado River. Most of New Mexico drains into either the Rio Grande or the Pecos River, its tributary. Other watersheds of New Mexico include the Canadian River in the northeast, the San Juan in the Northwest, and the Gila (tributary of Colorado River) in the southwest.〔http://maps.howstuffworks.com/united-states-watersheds-map.htm〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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