When all nationalities speak in one language, it can be interesting and weird at the same time. It maybe easy in terms of communication but will be a cause of losing cultures and traditions at some point

When all nationalities speak in one language, it can be interesting and weird at the same time. It maybe easy in terms of communication but will be a cause of losing cultures and traditions at some point.
Firstly if all the people spoke one language there would be fewer problems with understanding each other. For example thousands or even millions of people this day travel to different countries, understanding and cooperating with various nations is the major problem for most of the travelers.
One argument against is when this statement true there would not be any international relations because simply it would not be any nations. Language is the most important thing when we want to keep nation or our country traditions alive. For example in Poland the language was the way in which people indentified themselves as Polish when they were under occupation.
In conclusion, people always made, make and will make some problems between nation, religion, race etc. The idea of one international language for me it is not a way to heal the world. Moreover from my stand point world will be less colorful without variety of languages around the world.