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The payload of an Unha-3 is 1500 lbs. The most powerful U.S. nuclear weapon with that approximate weight was the W-49 which had a 1.44 MT yield. Coincidentally, the W-49 was used in a high atmospheric nuclear.

It did produce an EMP but Hawaii which is 900 miles away only experienced slight effects. It knocked out a telephone company uplink, some street lights went out, some security alarms went off, etc...There was no massive black out. The electrical grid was fine there. The effects closer to the blast in uninhabited areas were much greater.

IF the North Koreans could get a missile here and IF they could construct a warhead similar to the W-49 and IF they could properly detonate it above Kansas City it would certainly cause a lot of issues. Cities as close as Columbus to the east, Denver to the west and Dallas to the south would barely be affected at all. Cities in the middle of the area such as Oklahoma City, Des Moines, St. Louis and Witchita would likely only have moderate damage to electrical infrastucture. Millions of people would die. We would go to war. But I don't think civilization would come to an end.

However, the world as the North Koreans know it certainly would end.