“Has there ever been a case in history where terrorism achieved its stated political objectives?”
In recent years:
Terrorists succeeded in taking over Algeria from the French.
Pol Poi took over Cambodia
Rhodesia ended up in Terrorist hands (Mugabe).
South Africa was taken over by the Terrorists.
Nicaragua was taken over by Terrorists.
Quick list off top of my head.
Two more:
United States/ Washington [Great Britain]
Israel/ Ben Gurion [Great Britain]