So where does WWI and 1914 fit into this depiction of human history?
It is my conviction that 1914 is yet another turning point prior to "C" and yet after "B".
When Jesus Christ was ressurrected this happened:
Psalm 110:1-2
The utterance of Jehovah to my Lord is:
"Sit at my right hand
Until I place your enemies as a stool for your feet."
2 The rod of your strength Jehovah will send out of Zion, [saying:]
"Go subduing in the midst of your enemies."
Jesus Christ "sits" for a period of time.
There comes and end to that period of time as directly stated in the scripture above:
"Until I place your enemies as a stool for your feet."
I believe the "sitting" stopped when this scripture in Revelation Chapter 12 was fulfilled:
Revelation 12:10-12
"Now have come to pass the salvation and the power and the kingdom of our God and the authority of his Christ, because the accuser of our brothers has been hurled down, who accuses them day and night before our God! 11 And they conquered him because of the blood of the Lamb and because of the word of their witnessing, and they did not love their souls even in the face of death. 12 On this account be glad, YOU heavens and YOU who reside in them! Woe for the earth and for the sea, because the Devil has come down to YOU, having great anger, knowing he has a short period of time."
"because the accuser of our brothers has been hurled down" - "Until I place your enemies as a stool for your feet."
The significance of 1914 is that Jesus Christ is no longer "sitting".
So 1914 "fits" after period "B" and yet we are still before period "C".
A scriptural milestone happens in between the two periods you indicated.
The Apostle Paul also acknowledged this milestone event that was to happen in the future:
Hebrews 10:12-13
But this [man] offered one sacrifice for sins perpetually and sat down at the right hand of God, 13 from then on awaiting until his enemies should be placed as a stool for his feet.
So yes, 1914 is "A Turning Point In History"
Jesus Christ is no longer "waiting".
abe