Since North Korean ICBM can strike within U.S range.Does USA feel being threaten and scare?

Threatened but not scared. We are going to have to continue the Korean conflict (1950 - 1953) which is because North Korea has refused to sign a peace treaty. There will be a lot of blood on both sides but North Korea will end up back in the stone age. And this will take place long before North Korea has a reliable weapon of mass destruction. We are not going to wait until North Korea can blackmail us.

yes

I am not terribly concerned. I think we could likely intercept any nuclear weapon used. Also, they have to recognize that if they strike us, it will certainly kill many Americans and our response would be to wipe them out.

The Clinton/Carter/Albright nuke 'deal,' where we PROVIDED the funds for N Korea to buy fuel rods if they would return them INSTEAD of reprocessing them into Plutonium. to BUILD nuclear bombs. This was TRULY one of the greatest triumphs of Democrat 'diplomacy.' Right up there with Truman's UN with USSR 'security' council veto power, leading to the Democrat/UN/USSR cold 'war.'

People who fail to use their brains and fail to think about this rationally may feel threatened, but the US has been in range of Russian and Chinese missiles capable of carrying H-bombs for decades. We believe that NK has a missile capable of reaching the US, but can it carry a payload the same distance, or was the thing empty? We also don't know whether the have a deliverable nuclear bomb, and that is very unlikely. They certainly don't have H-bombs. They know that they can't try anything with the US or it's the end of NK.

I ain't scared. Just need to take action because, of our allies such as Japan, South Korea, Australia,etc. if anything I see this strengthening our ties with these countries. They know we have their back.

Depends on where you live. I'm in Florida, so I don't really care.

Currently North Korea possesses no ICBM than can strike the US.

Are they trying to develop such a system? Yes.