In that case it would be
the apocalypse
Neither Cambodia or Romania were remotely socialist, in the European sense of the idea. They'd probably call themselves Marxixt/Leninist or similar, though I doubt Marx or Lenin would have accepted that!
Britain is a socialist state - to varying degrees. Peaked in 1945 with the Attlee government and major socialist reforms mostly still with us, successful and highly regarded, though somewhat under threat at the moment
USA was founded on socialism. You should read
Thomas Paine.
I lifted this from the web:
Many people see the term "socialist" and run scared without doing much research on "democratic socialism". Several of the country's early leaders were of a democratic socialist persuasion as seen in their laws and literature, although the "ism" terms did not really exist when this country was developed. Remember: the preamble of the US Constitution sets out the objectives of this country and the Bill of Rights and Amendments are only "add ons" to implement the preamble. Our forefathers were very much against the domination of the moneyed class (their term was "aristocracy"). Alexander Hamilton believed that taxes were a necessity. George Washington believed in "liberality". At the time of our country's birth, liberals were those who believed in developing a country for the people and away from the kind of money dominance of big banks, corporations and aristocracy in Great Britain. Conservatives supported the British rule and the dominance of a "monied class". During the early stages of the United States, corporations were limited and licensed. “I hope that we shall crush in its birth the aristocracy of our monied corporations, which dare already to challenge our government to a trial of strength, and bid defiance to the laws of our country.” — Thomas Jefferson.
Hope that helps!