The Four Horsemen of the Apocalypse, figures the biblical prophecy of a Divine Apocalypse upon God's final Judgment on Earth, for setting a divine end-time of the World of Evil.
The riders reference the four Biblical Horsemen from the Apocalypse, who represent Plague (or Disease), Wars, Famine (or Food Shortage), and Death.
The prophecy describes a period of time when a quarter of the population of the earth would be killed by a combination of infectious disease or plague, wars and famine.
Maybe the Apocalypse has already begun in year 2019 and might will go over 6 apocalyptical years. We will return to the then New World, after those Horsemen of the Apocalypse have left the planet sometime in 2025.