The first major wave of Azerbaijanis came to the U.S. in 1940s and 1950s, as many Azerbaijani émigrés and POWs left the Soviet Union and Iran during and after World War II. Among those were also a number of expatriates, who fled to Turkey, Iran or parts of Europe upon the Soviet occupation of Azerbaijan in 1920, and in 1950s and 1960s, moved to the United States in pursuit of better economic opportunities. This wave of Azerbaijani immigrants settled mainly in New York City and its metropolitan area, which hosts the largest population of Azerbaijani-Americans, in Northern New Jersey and Massachusetts; and later in Florida, Texas, and California, especially in Los Angeles area where there is a large Iranian community, some of whom are Iranian-Azerbaijani. In 1957, a group of these Azerbaijani settlers in New Jersey founded the Azerbaijan Society of America, a first Azerbaijani-American community organization. By 1980 there were around 200 families that identified themselves as Azerbaijani in the United States, with about 80% of them being endogamic. In 1976, Houston and Baku established the first sister-city association between the cities in the U.S. and Azerbaijan. It was followed with a sister city between Honolulu, Hawaii and Baku in 1988, Newark, New Jersey and Ganja (second largest city in Azerbaijan) in the early 2000s (decade), and Monterey, California and Lankaran in 2011.