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Illegal immigration to the United States is the act by foreign nationals violating United States immigration laws by either entering the country without government permission (i.e., a visa) or once lawfully entering, remaining within the country beyond the termination date of a temporary visa. The United States Department of Homeland Security (DHS) has estimated that 11.4 million unauthorized immigrants lived in the United States in January 2012. According to DHS estimates, "the number of illegal immigrants peaked around 12 million in 2007 and has gradually declined to closer to 11 million."〔Amy Sherman, (Donald Trump wrongly says the number of illegal immigrants is 30 million or higher ), Politifact (July 28, 2015).〕 The DHS estimate "is in the same ballpark as several independent organizations that study illegal immigration, including Pew Research Center (11.3 million); the Center for Migration Studies (11 million), which studies migration and promotes policies that safeguard the rights of migrants, and the Center for Immigration Studies, which advocates for low levels of legal immigration (11-12 million)."〔 36% were from other Latin American countries, primarily from Central America;〔 12% were from Asia; 5% were from Europe and Canada; and 3% were from Africa and the rest of the world.〔 ==Profile and demographics== (詳細はHispanic communities, increasingly illegal immigrants are settling throughout the rest of the country.〔 In 2012, an estimated 14 million people live in families in which the head of household or the spouse is in the United States without authorization.〔 Illegal immigrants arriving recently before 2012 tend to be better educated than those who have been in the country a decade or more. A quarter of all immigrants who have arrived in recently before 2012 have at least some college education. Nonetheless, illegal immigrants as a group tend to be less educated than other sections of the U.S. population: 49 percent haven't completed high school, compared with 9 percent of native-born Americans and 25 percent of legal immigrants.〔 Illegal immigrants work in many sectors of the U.S. economy. According to National Public Radio in 2005, about 3 percent work in agriculture; 33 percent have jobs in service industries; and substantial numbers can be found in construction and related occupations (16 percent), and in production, installation, and repair (17 percent).〔 According to ''USA Today'' in 2006, about 4 percent work in farming; 21 percent have jobs in service industries; and substantial numbers can be found in construction and related occupations (19 percent), and in production, installation, and repair (15 percent), with 12% in sales, 10% in management, and 8% in transportation.〔 Illegal immigrants have lower incomes than both legal immigrants and native-born Americans, but earnings do increase somewhat the longer an individual is in the country.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Illegal immigration to the United States」の詳細全文を読む スポンサード リンク
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