I don't care the purpose of these war, but i have a question, what is it claims? what does this mean?
Actually not much, it was a pure invention of the first strat when there was little clan and that EU had shared the cake. But it was quickly realized that this was nothing, claims only worked if you could take them by force, to be honest, it was also used to give an excuse to declare war, and large clans could eradicate a smaller one (crusades and vengeance also works).
Finally it is the clan that made no claim that had the largest share of the cake.