The One World Government, or First Beast, outlined in Revelation 13, is a political system that will be in place over the entire world during the Tribulation. This governing body will have 7 world nations roughly based on continental boundaries, and there will be 10 officials (10 kings) that head this system (Rev 13:1). This system has been in the process of being set up for centuries, but a big step was taken in 1945 with the establishment of the United Nations.
The One World Government, or New World Order, will be a communistic system that controls its citizens through the Four Hidden Dynasties (religion, politics, economy and education) which have been gaining strength in the world over centuries (Daniel 7:6, 8:8, Zech 1:18-19).
The leader of this One World Government is known as the Raiser of Taxes (Dan 11:20), and he will give way to the antichrist halfway through the tribulation (Dan 7:7-8, 8:13-14, 9:27, 11:21-45, 12:6-7, Rev 11:1-2, 13:11-18). When the antichrist arrives on earth in that midpoint, the One World Political System (Dan 7:7, Rev 13:1-10) will become a One World Religious System with the antichrist himself as its leader (Dan 7:8, Rev 13:11-18). Antichrist and his system, in the second half of the Tribulation, is known as the Second Beast, and it will force everyone of the world to worship the beast (Rev 12:9, 13:13-14), and everyone who does will receive the Mark of the Beast (Rev 14:9-11). The world will want to worship him because he will seem to be a benevolent messianic figure (2 Thess 2-3). Most Christians will believe he is Jesus. Those of other religions will believe he is also their respective messiahs, and he will claim that really all messiahs are actually one being, and it is he who is that being.
There will, however, be a small group of people, God’s elect, who will recognize antichrist and the beast and will refuse to bow to him (Matt 24:24). These people are the only ones in the world who will not be deceived by this system because they are sealed by the Holy Spirit with the Seal of God (Romans 11:4, Rev 7). Because the elect will not bow to antichrist, they will be delivered up to testify as to why they will not (Matt 10:17-24, Mark 13:9-13, Luke 12:11-12, 21:12-15, Rev 2:10). At this time, the Holy Spirit will speak through their mouths and say things that no one will be able to deny (Luke 12:12, 21:14-15).
It is imperative to know and be able to recognize the First and Second Beasts before we enter the tribulation.