Leaving office in 1989, Reagan held an approval rating of 68%. Due to Reagan's impact on public discourse and advocacy of American conservatism, some historians have described the period during and after his presidency as the Reagan Era. The 1980s saw the highest rate of immigration to the United States since the 1910s, and the proportion of the foreign-born population reached its highest level since the 1940s. Reagan did not make immigration a focus of his administration, but he came to support a package of reforms sponsored by Republican Senator Alan Simpson and Democratic Congressman Romano Mazzoli, which he signed into law as the Immigration Reform and Control Act in November 1986. His doctors have noted that he began exhibiting Alzheimer's symptoms only after he left the White House.On July 13, 1985, Reagan underwent surgery to remove polyps from his colon, causing the first-ever invocation of the Acting President clause of the 25th Amendment.
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