MERCOSUR is an abbreviation of "Mercado Comun del Sur": common market of the South America: most of the eastern South American coutries are members of this common market.
It's a trade block of countries in South America which promotes free trade and free movement of people.
The Soviet Union defeated Germany at Stalingrad, marking the turning point of the war in Eastern Europe. American and Allied troops landed in Normandy, France, on D-Day to begin the liberation of Western Europe.
Because they probably don't know all the mean and hurtful things people can say or do. OR they haven't seen the things of this field so they don't have to worry and cry because maybe they don't have huge muscles like some guy they saw in a magazine.