As an American do you feel threatened that the position of superpower is effectively over ? ?

The US being a superpower was the problem, especially when Bush started the preemptive strike crap. It scared the world after he attacked Iraq and devastated it. Now the US and the world has more countries arming themselves with nukes to prepare for a possible US invasion. Hopefully now, as you say, the US is no longer a superpower, we won't be a treat to the rest of the world. However, I think the US still is a superpower and will be for a long time with all the nukes it has that is relies on exclusively as a negotiation tool which makes the US still a threat to the world and a bully.