The Anglo-Saxon, Germanic, Scandinavian, Celtic, and kindred people are the Israel people of the Bible today.
Granted, we are saved by grace and faith and not by race, and members of other races can now find salvation in Jesus Christ, but God still has His special people.
The passage in Revelation 16 12-16 refers to the actual Euphrates River being dried up. This is because this passage mentions the kings of the east and in another place in Revelation it speaks about an army numbering 200 million. China is the only country that can supply an army that size.
People say, "But if the armies of East Asia marched into Palestine, the Israelis would launch a nuclear weapon at the invader's nation." The Israelis will not do this for two reasons. First of all, all the other nations have nuclear weapons. Second, the Jews are too cowardly to do such a thing.
The 144 thousand are the remnant of the twelve tribes of Israel who are still alive during the tribulation. They will rule over the rest of the world during the millenial reign--including the multitude made up of members of other races who've come to faith in Christ as well as the unsaved who are left alive.