Who were the groups that are on the same side in the war?

In many historical contexts, groups on the same side in a war often include allied nations or factions united by common interests or threats. For instance, during World War II, the Allies, including the United States, the Soviet Union, and the United Kingdom, fought against the Axis powers. In the American Civil War, the Union and its supporters were on the same side against the Confederacy. The specific groups can vary widely depending on the conflict in question.