The Big Three Edit
These countries were part of the original Big Five, but eclipsed the other members to the point that they came to be considered on an entirely different level by both human powers and the Race.
The Other Big Two Edit
These countries were part of the original Big Five but gradually came to be considered second-rate powers as the above three eclipsed them in terms of industrial and military capacity.
Other Members Edit
The above five nations were the only countries which participated in coordinating strategy and which were represented at the Peace of Cairo. Members of the Big Five supported neighboring governments which were resisting the Race, and anti-collaboationist partisans who opposed governments working with the Race, seeking to make the latter the governments of their countries.
When the Conquest Fleet arrived in 1942, the members of the Big Five were locked in struggle against one another in World War II. These nations collaborated as closely as possible early on in the invasion, holding periodic strategy conferences in London--but their relationships were often tense as many of them still considered each other enemies.
After several years of fighting, it became clear that the US, Soviet Union, and Germany, which built and used atomic bombs, were more powerful and more important than Britain and Japan, which did not. However, all five were represented when Atvar convened a peace conference in Cairo, and all five were granted recognition as sovereign entities by the Race, though only the "bigger three" were allowed full diplomatic relationships with the Race--until Britain and Japan developed their own atomic weapons after the war.