From the time of Satan's loosing (1988) until May 21, 2011, it seemed as if he and the world were constantly victorious. The world was triumphant as it exalted itself over the dead and desolate corporate church. It was the time when the death blow that Satan suffered at the cross seemingly was healed and all the world wondered after the beast.
However, that time has past. It is no longer the case that the world is triumphing. Obviously it is not. The world has lost and is losing. On a daily basis we hear reports of the world losing battle after battle. Shameful defeats. Humiliating defeats. Embarrassing defeats.
The answer is because Christ has taken the kingdom of Satan away from him and has divided his house (this world) causing it to fall (Babylon has fallen, has fallen).
Since the date of May 21, 2011, this verse is being fulfilled:
Revelation 11:15 And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign for ever and ever.