U.S. officials and intelligence analysts now see China, not terrorism, as the greatest long-term threat to U.S. stability. The emergence of China as a potential rival is considered the next big threat, as China's military has expanded dramatically along with its economy and population. This is fueling tensions with Europe over lifting a ban on military technology sales to China, and with concerns that China's growing influence and unchecked military rise could challenge U.S. power in the Asia-Pacific region and beyond in the 21st century.