Colorado. Statehood President Grant signs bill admitting Colorado to union, 1875. smiley.History .Colo.v.1 p.488 Admitted by president's proclamation, August 1,1876. Byers.Hist.Colo.v.l p.214 Admitted to the United states as a state, 1874. Hall.Hist.Colo.v.2 p.356 Constitutional convention held, Denver; officers elected; proceedings. Hall.Hist.Coio.v.2 p.288 Reasons, progress, advantages. R. M. News. Dec. 16, 1871 p.2c.2. s