The INS report also presents data that shed light on the apparent decrease in illegal entrants to the United States in the early 1990s. According the data, the illegal alien entry rate decreased because the IRCA made it easier for the spouses of Mexican-born residents to obtain immigrant visas.
As a result they did not have to enter the United States illegally, though hundreds of thousands of others continued to illegally enter the United States. The Immigration Act of 1990 – passed under George H.W. Bush – increased the annual number of immigrant visas to the United States by more than 150,000 beginning in 1992.