Some will say Rome because Constantine made Christianity into a political construct and institutionalized it as the official state religion. However, every aspect of his actions had political motivations rather than religious ones. Even the cross he saw going before his army that he claimed was his spiritual awakening was bunk; the Roman armies nearly always carried a large cross at the front of their columns, often with a dying man nailed to it to intimidate their foes, so of course Constantine saw a cross. The symbol for Christians at the time wasn't a cross but a fish, the symbol for the age of Picses, which Jesus' birth ushered in. Jesus said, "let no man call me Christ" and the early followers were divided into several camps. It was the Pauline camp that advocated calling themselves what Jesus specifically prohibited and it was this sect that was perverted by Constantine into the Roman Catholic church. But there always was a Roman Catholic church because catholic just means universal and the state religion of Rome was Roman Catholic long before Jesus' time. There were many feudal and city-states that officially adopted the teachings of Jesus in the 2nd and 3rd centuries in Africa, the Middle East, India and the Mediterranean, even as far as the British Isles. Some followed the teachings of Paul rather than Jesus, and virtually all the original followers of Jesus were massacred by the Pauline christians. But would that be called Christianity or Paulinity?
Rome.
Egypt
Sumer
sumer
sparta
empire state building
Memphis
socialism started in Russia
Christian Scott Moore has written: 'Worlds'
haha no
Jesus Christ
militaristic.^ that answer is wrong