France is an old colonial power, especially in Africa. The largest colonial country is France. At that time, in order to rule those areas more conveniently, France moved its own people to the colonies through immigration, making them the new owners of the colonies. After 100 years of development, by the end of World War II 1948, there were nearly 1 10,000 Europeans in Algeria, but mainly French. In the eyes of the French, the French descendants of these people constitute the basis for France to effectively rule Algeria. However, quite a few of these people seem to have more national feelings for Algeria, and they just regard France as their "mother's home". Long-term rule has led to the French people's emotional closeness to Algeria.
Even though French descendants are only a minority in Algeria's total population, neither population nor culture is dominant. France still wants to "French" the Algerians, and although it has made a lot of "efforts", it finally failed. Finally,1July 3, 962, Algeria officially broke away from France and became a country. However, due to the special relationship between Algeria and France, many Algerians often choose France as their first choice for immigration.
So when Algeria reached the final of the African Cup of Nations, the French cheered the victory. They always thought Algeria was a part of France. These factors have caused the French people to have a deep sense of closeness and cheer for Algeria to win the championship.