I’ve taken to thinking of being a Christian in the US as someone with several somewhat similar perspectives but with the dual purpose of damage control and steering towards good things.
First, as an exile. The US is not the nation in which I hold my citizenship. That nation is both here and not, but it is not the US but there are pockets of other exiles here as well. To use Jeremiah’s attitude, as an exile who will be here for the long haul, “Do good for the city in which you are found“. By doing good here, it will benefit me as well as benefit those who are here with me. This is kind of the “damage control” aspect of things.
I am also an ambassador, a representative of another nation, an ex-pat who acts as a representative of that “foreign power” here seeking to promote the interests of that foreign nation. That I will negotiate and try to get the US to align closer with that other nation without necessarily taking over. This is part of the “pointed towards good things”.
The other part of “pointed towards good things” is as a counter-insurrectionist. This is C.S. Lewis idea that there is a rightful ruler that has been usurped by other powers. I am present in this nation as a deployed counter-operative whose goal is to bring others into this new allegiance and to work towards counter-acting those things that the usurpers are doing. This also plays somewhat towards “damage control”.
In summary, I’m here to do the most good possible in service to my nation of allegiance. While that means I interact with the systems of the US, I’m not so invested in them that when they fail (and they will) it will mean devestation for me, personally. No matter what earthly nation I find myself in, whether the US continues or something new takes its place, I remain, as always, the exile, ex-pat foreign ambassadorial counter-operative for Christ…because every kingdom EXCEPT his, is not my own.
EDIT: 11/12/2020 – Bruxy Cavey writes a more complete explanation here. Enjoy!