Economic differences between North and South Korea are also a cause of concern.

There was no other significant contact between North and South Korea until 1984.

The chances of war between North and South Korea would increase.

The difference in economic development between North and South Korea was evident by the early 1970s.

Won is the currency of both North and South Korea.

That area is now divided between North and South Korea.

But the difference over who started the war remains central to the tensions between North and South Korea.

Until now, direct trade between North and South Korea has been prohibited.

Currently the border between North and South Korea is closed.

"North and South Korea," he reminded his friend, "have been under a cease-fire for years."

Economic differences between North and South Korea are also a cause of concern.

There was no other significant contact between North and South Korea until 1984.

The chances of war between North and South Korea would increase.

The difference in economic development between North and South Korea was evident by the early 1970s.

Won is the currency of both North and South Korea.

That area is now divided between North and South Korea.

But the difference over who started the war remains central to the tensions between North and South Korea.

Until now, direct trade between North and South Korea has been prohibited.

Currently the border between North and South Korea is closed.

"North and South Korea," he reminded his friend, "have been under a cease-fire for years."