What was the effect of the demilitarized zone?

It was the site of peace discussions during the Korean War and has since been the location of various conferences over issues related to North and South Korea, their allies, and the United Nations. The areas north and south of the DMZ are heavily fortified, and both sides maintain large contingents of troops there.

Explanation:

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.