Oh, they existed, they just didn't have a political movement promoting them, public promotion of them would have been dealt with severely, libertarianism did not even exist then.
You have to look at the last 60 years to see libertarianism explode into America, leading to the acceptance of the left's morality and the suppression of Christianity and conservatism, and the natural growth of government that libertarianism requires and creates.
I have to strongly disagree with your assertions that Libertarianism is inherently immoral or even amoral. You are conflating two very different things – liberty and morality. The absence of liberty does not lead to morality – quite the contrary – it stifles it’s most powerful expressions. Likewise, the existence liberty does not lead to immorality – it provides oxygen to enable fresh inspirations.
The Bill of Rights is a study in Libertarianism and is a bulwark against the tyranny of the majority against the Natural Rights of any minority. It doesn’t try to enumerate all Natural Rights as if they're granted by their mention on paper by government and not from God – but it ensures them by restricting government from encroaching on the liberties of individuals.
One definition of Libertarianism states:
"Libertarianism is a set of related political philosophies that emphasize the primacy of individual liberty, political freedom, and voluntary association. Libertarians advocate a society with a greatly reduced state or no state at all."Friedman, David D. (2008). "libertarianism," The New Palgrave Dictionary of Economics, 2nd EditionSo maybe it’s time that you take a fresh look at the benefits of individual liberty over government force.