What technological advances led to the downfall of both medieval african and american civilization

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.

trade

explanation:

hello,

what started the norman conquest?

profound political, administrative, and social changes in the british isles. last line of my information: )