My dear Brother Murray:
Let me re-approach matters: I cautioned against an overly judgmental, dogmatic, moralistic approach to history. We simply do not have the resources to render exhaustive judgments as we would if divine writ gave us the correct interpretation. Those who think that we do are really not careful students of history. Only the Lord can properly do this. I suspect many things from history will surprise us considerably at the end.
This does not mean that we can not have opinions, even strong ones, and render judgments, but ones open to correction. I agree that we can learn from the past in a measure--Philip refers to case studies, appropriate for a philosopher

--even in terms of shaping our own conduct.
But your approach seems to be, if the American War for Independence was wrong, then there's nothing to celebrate in terms of American independence and I would challenge that at the most fundamental level. Friend, let's say the Founding Fathers were to a man wrong, that does not mean that what came about was not a providential good. That wicked men put to death the Lord of glory is the most heinous act of all times, that God turned to the most remarkable good. One may say, that's different. Surely it is unique. But God is a God who delights to take our messes and bring glorious things out it.
We are messes, and He has saved us. I thank God for His people, though we are all profoundly sinful. Much remains wrong with us, but when I speak to my wife, I often speak to her as the Lord sees her, and as he enables me as her husband to see her: I say to her, "I find no fault in you." Is that a lie? Satan would say so. But in Christ she has no fault. And neither do you, or I. I am calling for the ability to look at something and in spite of many problems see the good that God brought out it.
If someone can not see the good that God brought out of the founding of this country, there's something profoundly wrong. What we've become is lamentable. But God did marvelous things in bringing folks here in 1607, 1620, 1629, and following. This country then became its own nation--I agree that it was not without fault. People can talk about what they would have done at that time (though that's more a philosophical exercise than necessarily a historical reality), but can we deny that God used America and Britain in centuries past--a Britain that had a Civil War (and put the king to death--opposed by the Presbyterians) and an America that had a War for Independence? My wife's folks in New Jersey were good loyalists. I admire and respect them. My ancestors fought for the South and hers for the North in the War Between the States--I repudiate neither.
Let me put it as James Boice did before he died: when asked if he would choose differently if he could live over, he said no, for in spite of all his own personal sin and failure, he opined, he could never choose better than His Lord--who does all things well--had chosen for him. I am calling for a maturer approach that understands that since history is the outworking of God's sovereign purposes, we can thank Him for what He did in spite of all our sins and failures. I find it a bizzare and disheartening exercise to judge in the way some here are calling us to do on whether the War for Independence was wicked and should be rejected or righteous and should be embraced. Good folk who have the same system of doctrine can believe differently about these matters (no greater illustration of this than the U.S. Civil War).
Peace,
Alan