There is only one answer and that is for this country to go to the secrets of 1Chron7:14 and earnestly seek God for the answer.
Mercifully God has been kind to reward groups within nations with such a blessing. A well known example is how God blessed the Hebrews in Goshen of Egypt while the rest of Egypt plummeted into mayhem. Exodus 8:21-23 Else, if thou wilt not let my people go, behold, I will send swarms of flies upon thee, and upon thy servants, and upon thy people, and into thy houses: and the houses of the Egyptians shall be full of swarms of flies, and also the ground whereon they are.  And I will sever in that day the land of Goshen, in which my people dwell, that no swarms of flies shall be there; to the end thou mayest know that I am the Lord in the midst of the earth.  And I will put a division between my people and thy people: to morrow shall this sign be.
There are too many promises from God toward His children of faith to allow for the Church to be punished, though I suspect the Church is much less populated than pollsters claim. The Lord has not manifested Jesus to stand by watching the faithful suffer. However, the protection from Heaven is clearly in the Word of God and those who stand upon it in unwavering faith.
I am convinced that many of our friends have kept fortunes invested in the stock market and other manifestations of the Kosmos, the world system (Jn 12:31), which is of the spirit of Babylon which will rise again in power over the world. Most have no doubt grown their savings to fortunes they can't possibly spend doing legal and moral things, but tend to leave it all growing even greater. I consider that greed and living dangerously. It would be far better to take it out and begin blessing neighbors, growing the Covenant on Earth. It might very well happen that one day all those hoarded fortunes will disappear overnight, fallen into the hands of the greediest people on Earth with power to steal their vast sums. That system will fail, and the 'people of Babylon', those who choose to hoard wealth, will wail and cry over their great losses, never to recover them.
The children of God who are already obedient to open their resources up to the gospel will not have reason to cry over such losses. Their fortunes however small or great will have been shielded by angels, doing what that wealth was meant to do. We will gain witty inventions, find many ways to get resources, even be fed by ravens under a fig tree if necessary, or even by new manna falling on rocks. Those of us who are no longer attracted to the trappings of worldly wealth will not miss them when the banks empty in a day, Wall Street is occupied by wild animals. The nation's capitol will be deserted, sacked of everything precious, yet the children of God, those pleasing Him by faith will prosper. I doubt any of us will find it useful to carry anything on us other than a set of clothes and a pair of shoes, yet daily discovering in hidden places whatever is needed by those around us.
I am not concerned that some invader would take over America, or any other nation, as all the Kosmos system in all nations will fall at once within probably one day, there being no way to finance military powers.
Now, if this nation would obey 1 Chron 14:7 specifically to both hate and forsake sin, obeying the commandments of Christ, then none of that would come upon us, leaving this nation to feed all the other nations. It would require a total intolerance of deliberate sin anywhere in the USA. God will not bless rebels who hate Him or neglect so great a salvation at His hands.
We already have all the answers in the Bible needed to turn it all around.
Be fishers of men.....DG