The answer is slavery it says it in the question
The United Nations was created at the end of World War II as an international peacekeeping organization and a forum for resolving conflicts between nations. The UN replaced the ineffective League of Nations, which had failed to prevent the outbreak of the Second World War.
The passengers of the Arbella who left England in 1630 with their new charter had a great vision. They were to be an example for the rest of the world in rightful living Future governor John Winthrop stated their purpose quite clearly; "We shall be as a city upon a hill, the eyes of all people are upon us."
They believed that they had the same say as men and that their opinions matter. They thought they deserved a voice in creating their society too.