In the history of European football team building, the design of the team emblem basically determines the color of the team jersey. You may ask so many teams that we don't know enough colors (colors can be mixed, indicating Milan's red and black, Barcelona's red and blue; Of course, it can also be a combination of jerseys (such as Inter Milan, Juventus, etc. Generally speaking, the color of the home team's jersey is the iconic color of that team. When a group of well-trained, well-dressed and purposeful athletes are like an army on the field, they will be called the Blue Army and the Red Army (generally speaking, only those very successful teams have this special treatment). Then you may question why Manchester United is also a red jersey and is called the Red Devils instead of the Red Army. That's because Liverpool was really famous before the Red Army.