"In a Good Cause—" is a science fiction short story by Isaac Asimov. The story first appeared in a 1951 edition of the anthology New Tales of Space and Time and was reprinted in the collection Nightfall and Other Stories (1969).
The story commences in the year 2755 of the "Atomic Era" (corresponding to 4700 C.E. in Asimovean chronology) and opens with a description of a statue on the grounds of the United Worlds organisation raised to Richard "Dick" Altmayer.
Altmayer and his friend Geoffrey Stock have opposing positions when conscripted into military service for a war between human-occupied star systems. Stock willingly reports for military duty, whilst Altmayer protests, believing that the various interstellar nations of humanity should be united and at peace.
Over a 45 year period, Stock reaches high military rank and then political office, whilst Altmayer is imprisoned and kept under house arrest several times. He starts political parties and protest movements, all of which fail to achieve their objectives of uniting humanity.
Ultimately, Altmayer's desire for a united humanity is achieved after a war against the Diaboli, an intelligent non-human race that also occupies several planetary systems in the galaxy. This unity, however, has been realised only through Stock's political manipulations rather than Altmayer's idealistic actions. Stock asks his one-time friend to be one of the delegates from Earth to a peace conference, but realizes that history will not record his own participation in the unification of humanity.
Stock: "And when they build their statues, they will build none for me."