The United States began regulating immigration soon after it won independence from Great Britain, and the laws since enacted have reflected the politics and migrant flows of the times. Early legislation tended to impose limits that favored Europeans, but a sweeping 1965 law opened doors to immigrants from other parts of the world. In more recent years, laws and presidential actions have been shaped by concerns about refugees, unauthorized immigration and terrorism.
Since enactment of the 1965 Immigration and Nationality Act, immigration has been dominated by people born in Asia and Latin America, rather than Europe.
In 1986, Congress enacted another major law – the Immigration Reform and Control Act – that granted legalization to millions of unauthorized immigrants, mainly from Latin America, who met certain conditions. The law also imposed sanctions on employers who hired unauthorized immigrants. Subsequent laws in 1996, 2002 and 2006 were responses to concerns about terrorism and unauthorized immigration. These measures emphasized border control, prioritized enforcement of laws on hiring immigrants and tightened admissions eligibility.
The most recent changes in immigration policy have been an exception to that pattern. In 2012, President Obama took executive action to allow young adults who had been brought to the country illegally to apply for deportation relief and a work permit. In 2014, he expanded that program (known as Deferred Action for Childhood Arrivals, or DACA) and set up a new program to offer similar benefits to some unauthorized-immigrant parents of U.S.-born children. The DACA expansion and the new program (Deferred Action for Parents of Americans and Lawful Permanent Residents, or DAPA) are on hold because of alegal challenge by 26 states.