GLOBAL CONNECTIONS: the Near/Middle East
October 3, 1965: A second wave of Middle Eastern immigration to the United States begins with the passage of new immigration laws.

The Immigration Act of 1965 abolishes the quota system established in 1921 that restricted admission to the U.S. according to a person's national origins. Prior to 1961, strong preference had been shown for people from Western hemisphere countries, while those from Eastern countries were given far fewer visas. In the late 1970s, with people fleeing political crises in Iran, Palestine, Lebanon, and Afghanistan, immigration from Middle Eastern countries to the U.S. will again rise dramatically.

PBS America's Story: Immigration Timeline
http://www.pbs.org/kcet/newamericans/3.0/3.3text.html

A timeline of immigration in the United States