What did Max Stirner (1806-1856) think about Egoism? -What is a Union of Egos?

-In 'The Ego and His Own' (1844) Stirner said the Individual is Purely Egoistical, with little interest in the Welfare of others, unless this can Benefit themselves -Without the Oppressive State, Sovereign Individuals would come together out of the Selfish Need for Security. and because working with others is Rational, even if it is not Natural -This would come from Self-Interested Humans driving voluntary actions. Individuals use Society to Advance their own Aims