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The Interstellar Alliance was formed in 2261 CE (243 years' time), in the aftermath of the liberation of Earth and the Shadow War. The members included the Minbari, Narn, Centauri, the Earth Alliance, and the remaining members of the League of Non-Aligned Worlds, as described in the episode entitled Rising Star. The purpose of the Interstellar Alliance is to create peace and prosperity among its member worlds, provided that its members agree to, and comply with, a code of conduct. The Rangers are the primary peacekeeping force for the Interstellar Alliance.
It is headed by a president, elected by the Interstellar Alliance Advisory Council. The legislature is the Interstellar Alliance Council, wherein each member government had a single vote. This was in stark contrast to the old Babylon council, where each great power (Earth Alliance, Centauri, Narn, Minbari, Vorlon) had a single vote, while the non-aligned worlds collectively had only one vote among them. Also, these votes were not distributed by species, but by government, as some races had separate independent governments, such as Earth and Mars, which were represented separately in the alliance.
After accepting a deal with the Earth Alliance which would protect his crew from disciplinary action but which left him jobless, John Sheridan was nominated to, and accepted, the position of President of the Interstellar Alliance, which he would hold for nearly 19 years. He would be followed in this position by Delenn. The identities of subsequent presidents are not known.
The Interstellar Alliance would be in existence for at least a millennium after its creation, although various members would temporarily leave the organization due to political, cultural, or cataclysmic events, as described in the episode entitled The Deconstruction of Falling Stars.