Population and Illegal Immigration in the United States

In the first 2 million years of American history, the population is a member of up to 10 million people, a small element of the world's ecosystem. Ten thousand years ago, with the advent of the Stone Age, the number of humans started to increase rapidly. When the population develops agriculture and animal breeding methods, the relative balance before these periods will be sunny. This allows them to stay in one place on the earth, not looking for food.

The actual size and origin of the illegal immigrant population in the United States is uncertain and difficult to judge because it is difficult to accurately calculate individuals in this population. Nationwide survey, administrative data and other sources of information vary. The number of illegal immigrants reached 12 million in 2007, then declined. According to data of nonpartisan Pew Research Center, the estimated number of illegal immigrants in the US rose sharply in the 1990s, "from the estimated 3.5 million in 1990 to the peak of 12.2 million in 2007", then the time of a major depression was. Mr. Pew estimates that the total population in 2014 is 11.1 million, accounting for about 3% of the US population.

According to statistics, illegal immigrants account for about 4-7% of the total population of the United States. Currently, the United States has 12 million to 20 million illegal immigrants. ("Advantages of illegal migrants") Despite the growing number of illegal immigrants, the US Congress is not doing substantial things about this situation. It is worth noting that the number of illegal immigrants in the Bush administration has increased even in 2004. With these shocking statistics, immigration reform is one of the most important problems facing the United States today. As the number of illegal immigrants in the United States increases, questions are raised about the impact of illegal entry into the U.S. economy, the criminal justice system, and the national security threat that may arise from unauthorized entry into the country . ("Do immigrants are problems in the US or opportunities?")