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【内容提要】自2001年9·11恐怖袭击以来,美国联邦政府便严格管控美国国界,以确保国土安全。美国约有21000个边界管控机构,每天处理约10万人次,它们在329个入境港监控着7000英里国土和2000英里水域。它们每天阻止约1000人非法进入美国。现在,美国约有1100万非法移民,他们非法进入美国,没有正式文件登记,一旦
【Abstract】 Since the Sept. 11, 2001 terrorist attacks, the U.S. federal government has strictly controlled the U.S. borders to ensure homeland security. There are about 21,000 border control agencies in the United States that handle about 100,000 trips a day. They monitor 7,000 miles of land and 2,000 miles of water at 329 ports of entry. They block about 1,000 people illegally entering the United States every day. At present, there are about 11 million illegal immigrants in the United States who illegally entered the United States and no formal documents have been registered. Once