A political-economic pact for collective colonial security, the Alliance is the central galactic institution of human society. The Alliance gained associate membership to the Citadel Council in 2165 and full membership in 2183, with Ambassador David Anderson or Donnel Udina (depending on the player's choice) representing humanity.
Human political-economic relationships vary between combative and lucrative. The turians who'd fought humans during the 2157 First Contact War have become valuable trade partners, despite residual social hostility.
Other relationships are even more complicated. The rapid rise of human political influence on the Council -- achieving in decades what other waited or are still waiting centuries to acquire -- has galvanized suspicion and resentment against humanity. That negativity is vastly outweighed by the respect and trust humanity earned by saving the Council during the 2183 attack on the Citadel, at the cost of Alliance cruisers Cairo, Cape Town, Emden, Jakarta, Madrid, Seoul, Shenyang, and Warsaw and their 2400 crew.
A political-economic pact for collective colonial security, the Alliance is the central galactic institution of human society. The Alliance gained associate membership to the Citadel Council in 2165 and assumed leadership in 2183, with former Ambassador Donnel Udina or Captain David Anderson (depending on Shepard's choice) presiding.
Many species regard humanity as a rogue race and its 2183 victory following the attack on Eden Prime as a brutal and calculated sacrifice of its military rivals. Humans allegedly leveraged military victory into a political one, carving associate membership out of the violently-depopulated Council.
Because of the human Spectre Shepard's pivotal role in saving the Council, many analysts conclude several humans will be made candidates for Spectre status, further solidifying the human contribution to galactic peace.
By achieving in decades what others waited centuries to receive, especially after so bloody a conflict, humans have guaranteed themselves deep hostility and fear throughout the galaxy.