This rider on the white horse is Satan instead of Christ, its Antichrist. This is symbolic of the rise of Babylon, or confusion, the Antichrist system. The seal is not the action of the event, the seal sets in motion the process that brings the event to past. The seals, trumps and vials are the same events just from different views of time. The seal is broken, then the trump sounds and the vial is poured out.
Deception is the first seal.
Lets go back to Matthew 24. War is the second event, but not a world war. Satan wants people to worship him, these wars will be to bring about one world government. Lets go to Revelation 6 for the second seal. And when he had opened the second seal, I heard the second beast say, Come and see.