Probably the most important geopolitical event of the 20th century consisted of many smaller events that they affected the entire world. That event would be World War II. Many countries suffered from this war. Also, many people around the world struggled as a result of the war. There were both the axis and allied powers that fought against each other mainly in Europe and Asia, but some of the fighting was done in Africa.
Many leaders are stilled talked about even many years later. I believe that World War II will still be discussed even years into the future because it had such an impact on the whole world. It doesn’t seem like there is any other war or other worldly event that was as important as World War II.