To be honest I’m going with Jesus on this one:
] And you will hear of wars and rumors of wars; see that you are not alarmed; for this must take place, but the end is not yet.
7 For nation will rise against nation, and kingdom against kingdom, and there will be famines and earthquakes in various places:
8all this is but the beginning of the birth-pangs.
9 "Then they will deliver you up to tribulation, and put you to death; and you will be hated by all nations for my name’s sake.
I’m not sure there is necessarily a contradiction. This could easily be referring to a difference time period. A one-world government could easily be preceded by, or succeeded by world wars. For example, this easily could be referring to WW1 and WW2 of the last century.
After all, it says “the end is not yet”, and references “the beginning of the birth pangs”. This begs the question, what follows the beginning? What is being “birthed” by these “pangs” (international war). I don’t think it’s as clear-cut as you think.
Revelation 13, 16-18: All alike, little and great, rich and poor, free men and slaves, must receive a mark from him on their right hands, or on their foreheads, and none might buy or sell, unless he carried this mark, which was the beast’s name, or the number that stands for his name. Here is room for discernment; let the reader, if he has the skill, cast up the sum of the figures in the beast’s name, after our human fashion, and the number will be six hundred and sixty-six.[3]
To me the idea that “all” will be subject this mark implies that there is some central authority mandating it. (Assuming that “all” refers to a global “all” - since I’d assume Jesus is speaking for the benefit of all the faithful, I think it would be difficult to think otherwise.)