Throughout United States history, immigration has become an integral part of the social fabric of our country, beginning centuries ago centuries. Only to become a hot topic in the United States in recent years, with the focus primarily on illegal immigrants. Illegal immigration occurs when people enter a country without government authorization. In 2008, the Center for Immigration Studies estimated that there were 11 million illegal immigrants in the United States, down from 12.5 million people in 2007. Although the Center's estimates studies on immigration are very different from other estimates ranging from 7 to 20 million. While the Pew Hispanic Center estimated in March 2009 that there were 11.1 million illegal immigrants, this figure matches the March 2007 peak of 12 million. The exact number of illegal immigrants is unknown because it is illegal immigrants. A 2005 report from the Pew Hispanic Center indicated that 22% of illegal immigrants came from Latin American countries, mainly Central America, 13% from Asia, 56% from Mexico, 6% between Europe and Canada, and 3% were from Mexico. rest of the world and Africa. In the United States alone, nearly 70,000 foreigners emigrate here every day. Of these 70,000, more than 60,000 are businessmen, travelers and students; there are about 5,000 who are illegal immigrants; with 2,000 legal immigrants. The number of illegal immigrants has and continues to outnumber legal immigrants since the 1990s. Partly because of this, U.S. lawmakers have recently made even greater efforts to make comply with immigration laws. Here are the important dates for immigration to the United States. America's first immigration law was the Naturalization Act of 1790. Naturalization...... middle of paper ......gal_Immigration_Reform_and_Immigrant_Responsibility_Act_of_1996>."Illegal Immigration." Wikipedia, the free encyclopedia. Internet. May 5, 2011. “Immigration and United States History.” America - Engaging the World - America.gov. February 13, 2008. Web. May 5, 2011. “Immigration Law Facts.” Internet. May 5, 2011. .Reese, April. “Illegal Immigration to the United States.” Wikipedia, the free encyclopedia. Internet. May 5, 2011. “History of Immigration to the United States.” Fast Immigration - US immigration information in your own language. Internet. May 05 2011. .