The long gone value systems of the "Realm"

     Why is it that the leaders and law makers of the United States, Great Britain, Germany, and other European nations insisted on the keeping the same establishment from before that separated people based on race, creed of religion, behavioral characteristics, I.Q., class, and gender (just before and just after the turn of the nineteenth century).  The colonials and the African of Orange defeated the last of the British soldiers during the Jameson Raids (very near modern day Johannesburg, South Africa) in 1889.  Did the British Empire not catch on quick enough and realize the obvious fact that the College of Manchester had another agenda for Great Britain, or did the speakers of Parliament and the House of Commons only get a clue after their murderous, and shady little empire was completely lost in 1921, when Britain was told to leave the entire continent of Africa for the last and final time?