What are some of the challenges faced by nations today, and how do they combat these challenges?

 Things like co-vid-19 are challenges faced, and vaccines are what they use to get rid of it, pollution is another issue, solar energy is a combat for the issue, littering is another issue, and cleaning up is the way to solve it, running out of resources; Recycling to reuse the items.

Explanation:

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.

this question makes no sense dude