Fighting between Africans destroyed societies.
Germanic tribes, Visigoths
There were over 77 printing presses exstablished
The United Nations has only four purposes stated in the UN Charter of 1945. These purposes focus mainly on the maintenance of world peace and security, on the harmonious relationship among nations, as well as on having cooperation in eliminating international problems and issues, and above all, be the center on achieving the first three purposes.
The United States feared that if communism was successful on Vietnam, the rest of the countries that border it would soon turn into communism and those other countries that border that new communist country would also be converted to communism and so on. This is called the "domino theory" and made the United States to send troops to prevent the theory from happening.