Which country/continent is the biggest threat to the United States politically, economically, technologically, and socially?

Itself.

आप might think I'm kidding, but I'm not. The ridiculous bipartisan civil war that has just seemed to get worse and worse every साल is a threat to the security of our nation and our economy. There, I कहा it.

Politically I don't think there really is one.
Economically, technologically, and socially may be Japan.
North Korea is also a threat because they could decide to declare war on us, या south Korea (Both of which will end up in America fighting them) and they have Nukes, they won't be able to win a war at this point with the United States but they will cause a lot of permanent damage to the land and people.

Economically- China?

Politically - United States itself, perhaps.

Economically - China

Technologically - Again, China xD

Socially - US Itself.

North Korea. The state is corrupt, has been building nuclear weapons, and has made aggressive motions toward the States and our ally Japan. Nuclear war is the only real threat. I don't see economic and technological competition as threatening, but rather the signs of a healthy global community.