PRISTINA, Kosovo — Every Friday, just yards from a statue of Bill Clinton with arm aloft in a cheery wave, hundreds of young bearded men make a show of kneeling to pray on the sidewalk outside an improvised mosque in a former furniture store.
The mosque is one of scores built here with Saudi government money and blamed for spreading Wahhabism — the conservative ideology dominant in Saudi Arabia — in the 17 years since an American-led intervention wrested tiny Kosovo from Serbian oppression.
Since then — much of that time under the watch of American officials — Saudi money and influence have transformed this once-tolerant Muslim society at the hem of Europe into a font of Islamic extremism and a pipeline for jihadists.
Kosovo now finds itself, like the rest of Europe, fending off the threat of radical Islam. Over the last two years, the police have identified 314 Kosovars — including two suicide bombers, 44 women and 28 children — who have gone abroad to join the Islamic State, the highest number per capita in Europe…