There can only be 3 possibilities for the U.S. in the End-Times when Israel is invaded from the North:
- It is an ally of Israel
- It is unwilling to help Israel
- It is unable to help Israel (due to destruction or crippling by Israel's and the U.S.'s enemies)
In Isaiah 29:8 we get what may be a glimpse that the U.S. will be in the 2nd category (unwilling to help Israel) as it says: It will be as when a hungry man dreams-- And behold, he is eating; But when he awakens, his hunger is not satisfied, Or as when a thirsty man dreams-- And behold, he is drinking, But when he awakens, behold, he is faint And his thirst is not quenched. Thus the multitude of all the nations will be Who wage war against Mount Zion. [emphasis mine].
Additionally The Scriptures tell us:
Joel 3:2 I will also gather all nations and will bring them down into the valley of Jehoshaphat. And I will fight with them there for My people and for My inheritance Israel, whom they have scattered among the nations, and divided My land.
Zec 12:3 And in that day I will make Jerusalem a burdensome stone for all peoples. All who lift it shall be slashed, and all the nations of the earth will be gathered against it.
Zec 14:2 For I will gather all nations to battle against Jerusalem; and the city shall be taken, and the houses plundered, and the women raped. And half of the city shall go into exile, and the rest of the people shall not be cut off from the city.
Rev 14:8 And another angel followed, saying, The great city, Babylon, has fallen, has fallen; because of the wine of the anger of her fornication; she has made all nations to drink.
Rev 16:14 For they are spirits of demons, working miracles, which go forth to the kings of the earth and of the whole world, to gather them to the battle of that day, the great day of God Almighty.
From Matthew Henry's commentary: "This woe to Ariel [Jerusalem], which we have in this chapter, is the same with the “burden of the valley of vision” (Isa_22:1), and (it is very probable) points at the same event - the besieging of Jerusalem by the Assyrian army, which was cut off there by an angel; yet it is applicable to the destruction of Jerusalem by the Chaldeans, and its last desolations by the Romans. Here is, I. The event itself foretold, that Jerusalem should be greatly distressed (Isa_29:1-4, Isa_29:6), but that their enemies, who distressed them, should be baffled and defeated (Isa_29:5, Isa_29:7, Isa_29:8).
God is not ambiguous, when He says "all", He means "all"! I think for Israel to stand alone at that time would also follow the pattern we see all throughout the Scriptures - namely that God wants Israel and the entire world to come to reliance on Him rather than nations and peace treaties.