From Exodus3000 Wiki

You can create or join alliances to increase your influence over other players. The more players in your alliance, the more influence you will have. There is no limit to the number of players you can have in your alliance.

Many smaller alliances will accept any new member. Larger alliances may have special entry criteria, such as controlling a certain number of settlements. The top alliances, in terms of settlements governed, currently have over 10000 settlements.

By joining an alliance you get a small mining bonus which helps improve the probability of hitting a motherloade of Mars Dollars in volcanoes and ruins. You also get the protection of other alliance members as stronger members can govern all the settlements in the alliance to prevent other alliances from stealing them.

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