The united states sent forces to what area of the world in the mid 1990 to stop ethnic cleansing

The United States sent peacekeeping forces to Bosnia-Herzegovina in 1996. 
Bosnian Serbs had been carrying out a campaign of ethnic cleansing against Bosniaks and Croatians.  The United States also was involved in the Dayton Accords in November 1995, which were aimed at resolving the conflict in the Balkan region.

The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict