My favorite is the one that guarantees the rest
Are you hinting that you believe the 2nd is the most important amendment?
To clarify:
Many countries have guns. Only three in the world have a constitutional amendment giving the citizens the rights to bear arms: the US, Mexico, and Guatemala. Yet somehow most of the countries like ours, in terms of economics and the rest, are perfectly free, even though they do not have an constitutional right to bear arms. And I don’t think that constitutional right has ever been used in any meaningful way to actually defend the United States of America and the Constitution (its possible that it turned up a bit in 1812, but otherwise...?). So there is absolutely nothing to support the idea that our constitutional right to bear arms has had a meaningful impact on the rest of our rights, and indeed an entire world of history seems to indicate that it has not made said impact.
On the other hand... the first amendment is the embodiment of Freedom, THE value upon which the United States is built. The freedom of religion, the freedom of speech, the freedom to petition the government, the freedom to assemble, the freedom of the press... these were constitutional rights... indeed, essential freedoms... largely unheard of in the world until the birth of our great Nation. And it is our Nation and our people that upheld and spread this value, holding the American banner high, including through untold sacrifices, to billions around the world, for the betterment of said world. We are the beacon of hope, the shining example of Freedom, in world history.
The 13th amendment is another American embodiment of Freedom, this time taken as a conscious act of a nation and again made possible by unimaginable sacrifice. The 13th awoke our nation from what was, ultimately, an immoral, unholy, and frankly unAmerican nightmare, giving literal freedom and actually the rights to be and of an American to four million people who lived in bondage... not figurative bondage, but literal bondage... in our very nation. It was the most important moment in undoing the most horrible blight on our National soul.
And you think the 2nd amendment is the most important one?
I could not disagree more.