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... The number of cafes run by six major chains that serve Yemeni-style drinks grew 50% last year to 136, according to Technomic, a restaurant industry consulting company. The count doesn't include the many smaller chains and independent cafes serving coffees and teas imported from Yemen.

Yemeni coffeehouses are meeting the moment for several reasons. They stay open late -- sometimes past 3 a.m., especially during Ramadan -- and provide a place to socialize for the growing number of Americans who don't drink alcohol. Last year, a Gallup poll found that just 54% U.S. adults reported drinking alcohol, the lowest percentage in 90 years.

"Generally in the Middle East. our nightlife is coffee, right? People hang out at coffee shops, they play cards, they talk. We wanted to bring that here," said Ahmad Badr, who owns an Arwa Yemeni Coffee franchise in Sunnyvale, California. ...