The US is not scared of anyone right now. First, those who can do real harm to them are far away. They have plenty of time for protection. Second, what US should be scared of? Weapons ? They have their own. Financial instability? They can always print more money. Recourses? They have plenty of them and no one cancels trading. Third - no one will allow and support continental wars.
Right! Most people in America are too busy trying to get food and the things of life to even think about being scared of some other nation, or combination of nations. Besides, it's the job of government to be scared if they want. They shouldn't even be trying to make the people be scared.