It is always a non-starter to attempt to justify amoral behavior by the country's leaders today by tossing out the false dichotomy of "well, we did bad things in the past." Yes, we certainly did. And so has every single other country. The United States didn't corner the market on bad behavior. Every country has blood on it's hands. I'm not responsible for any of that because I wasn't here. Neither were you, so it has no bearing on this discussion. And that does not give anyone the right to vote for people who openly advocate sin, just because the country did bad things in the past. We are doing bad things right now, and the majority of Christians in this country just don't seem to care, and that speaks directly to where their relationship with Christ is at. At the very least, people who say it's OK to vote for a candidate that advocates abortion are estranged from Christ. You cannot serve God, and advocate amoral behavior at the same time. That is not possible.
Voting for a Christian does not mean one is attempting to create a theocracy. That is another rabbit trail. A Christian is supposed to vote for people who have good moral character. Spiritually, that is a simple no-brainer. Logically, everyone should know that amoral people do not make good leaders. They are incapable of being good leaders if they are amoral. I simply cannot wrap my head around the concept that someone who claims that Jesus is their Savior, and claims to now be a new creation in Christ can also walk into a polling place and cast a vote for a candidate that advocates abortion and tell themselves that that is perfectly OK for them, and God's cool with it. If they really believe that, they are in for one big surprise. They are violating every principle in the Bible every time they do so.