advancements in technology and agriculture
The modern country that was not part of that nation is Spain. East Prussia today is part of Russia, Lithuania and Poland. The answer to the question posted above is 'Spain'.
They met in Philadelphia but, what do you mean by the event?
Answer:
The King family and others believe the assassination was the result of a conspiracy involving the U.S. government, Mafia and Memphis police, as alleged by Loyd Jowers in 1993.
Explanation: