The principal purpose of the United Nations is to conserve worldwide harmony and protection.
Chapter 6 of the Charter presents for the pacific adjustment of conflicts, through the interference of the Security Council, by mediums such as compromise, negotiation, mediation, and administrative decisions.
If you are talking about the 1990s, the U.N. was not able to
help much. In Rwanda, it stood by as the
ethnic cleansing ran wild and many died as a result. In Bosnia, many U,N. peacekeepers
were either held hostage or shot by militias.
It was the intervention of the French in Rwanda and Americans in Bosnia
that turned things around.
Italian polymath Galileo Galilei espoused the view of heliocentricism in the early 17th century, contrary to the geocentrism which was commonly accepted at the time.