Final answer:
Hardline Islamists bring complications for Washington and its allies due to their strict interpretation of Islamic teachings and opposition to Western influence.
Step-by-step explanation:
The rise in hardline Islamist influence brings major complications for Washington and its allies. Hardline Islamists advocate for a strict interpretation of Islamic teachings and push for a more traditional and conservative society. They oppose Western influence and often express hostility toward the United States' intervention in the Muslim world.