If you would look at the political splits that existed during the revolution, they were very close to the split on any big political issue: one-third for, one-third against, and one-third not knowing.
A substantial amount of the "third" who were "for" our independence from England were slave owners.
If the colonists had to base a revolution on 'slave-free' states, they would have lost the entire southern section of the states in their movement, and some populations in the north. This means the revolution would most likely not have happened, or would have happened with the British having a tremendous amount of favorable ports and persons within our borders. Not Good!
Consider the possibilites. England would have had incredible power in its colonization. Slavery would have most likely continued; possibly even until today.
If they doubt this, I use the example of South Africa. It was a virtual slave state until a few years ago. Could you imagine how much power it would have had if America was still a colony of Great Britian?
Have fun with with your liberal friend. I always ask them why they didn't think of things like this....
Yeah and now it's a marxist state that is quickly sliding down to 3rd world hellhole status. Great progress there.
Another Point: I ask them outright if they understand even the basics of our government. I mean, a bookeeper should be able to know the basics of mathematics, shouldn't he? If not, what use is their opinion, since it isn't founded upon knowledge? What good is an opinion based on emotion and EGO?
Then I ask the liberal what form of government we have. It's a simple question, and the most basic one can ask.
Expect diversions when you ask this question. They usually don't want to answer it. So, redirect them back to the question, continuing to seek their answer.
They will usually (nine times out of ten) say that we're a Democracy, which is incorrect.
Article IV, Section 4 of the Constitution is clear that we're a "Republic."
I then ask them if they know what the difference is between a Republic and a Democracy. They usually don't have the slightest idea.
Then, here's the killer: I explain that elementary logic rules that for an conclusion to be valid, the premesis which support that conclusion must also be valid. Since their premise (that the US is a democracy) is invalid, their opinions are also invalid.
They hate that! Good luck!