Does the turmoil and destruction caused by a planet x [wormwood] come before or after the ‘demise’ of America (babylon) thru war? It would appear that the destruction of 1/3 of the world by this planet would utterly disable most of the wolds technologies (fuel, food, and electrical energy production/distribution, etc) .. making it nearly impossible for nations to wage war against one another. Not to mention that much of the worlds harbors and ships would lay in destruction also.
We can know for sure from Revelation 14’s three angel’s messages that the fall of America the Babylon occurs right before the rise of the Beast at the 5th trumpet that places the mark on everyone. This is because the 2nd angel message announcing the fall of Babylon comes before the 3rd angel message warning not to take the mark (which is introduced at the start of the Great Tribulation).
Further, America’s fall must be after the 4th trumpet which is the final effect of Planet X/Wormwood because the first angel’s message warning people to repent happens right before Planet X/Wormwood passes at the 6th seal. Because Planet X happens so fast in the 6th seal through 4th trumpet, it’s doubtful that an enemy attack would happen before the 4th trumpet hits. So I place the fall of America between the 4th trumpet and 5th trumpet for this reason. It makes a lot of sense as you say with infrastructure out that America’s military relies on more than any other country for its advantage that this would be when Russia and her communist allies would strike.
If you doubt any nation will have the ability to wage war after Wormwood, then just note that the 6th trumpet speaks of a war between the Beast (essentially the revived Roman Empire with England/the lion at the helm – Dan 7:4 ) and enemies from the north and east (Dan 11:44 – China and Russia) will start a war with him. Also there is the final war of Armageddon after this making a total of at least three clear wars prophesied after Planet X. (A fourth would be the pretrib, pre-wormwood Arab-Israel war coming first).