Shiites…make up about 15 percent of Muslims globally and in America…[and] until recently, differences [between Shiites and other Muslims such as Sunnis] mattered little in the United States, where the two groups bonded as Muslim minorities and prayed in the same mosques.
“There weren’t enough of either to justify the cost of building sectarian mosques, and because in general, early generation immigrants were less focused on establishing formal houses of worship,” said Andrea Stanton, a religious studies professor at the University of Denver.
That is changing, however, as American Shiites are increasingly establishing their own mosques. According to “The American Mosque 2011,” a survey sponsored by several Muslim American organizations, 7 percent of roughly 2,100 mosques in America are Shiite, and most have been built in the last 20 years.