One answer for why we've had this constitution, the same federal constitution for 234 years is that it's really, really hard to you need two thirds of both houses of Congress, which includes a convention call by the states Mental Health Association, ratification by three quarters of the states of my disclosure or convention, sign as part of the amendment of any national constitution. So that might be why we see so little amendment. But the thing about the Constitution, but our argument, at least when you compare them is that the ones that are very hard to sort of band, or they tend to snap and brutal. We want constitutions that advance so they don't break in this as the US Constitution is in that way. It's the hardest national constitutions we landed in the world. That means it should probably have the shortest lifespan so I don't think diseases really compelling. So another answer might be, instead of amendment, we just take issues to the Supreme Court to resolve constitutional meaning or to Congress. Sometimes Congress will pass statutes, not unconstitutional laws that still help us determine constitutional meaning. And I think that's, again, Jesus story. But remember that if we're only looking at national actors, we're still not fully understanding the process. So we don't think we can look only at national actors, right? Federal Judiciary, the federal judiciary, Congress has statutory lawmaking power in order to understand the US Constitution. So there's one other reason and I think this is maybe the best of the three, which is that Republic really, very, it's the US Constitution. So if you go down to the National Archives, and you get shot, by the text, on the baseball in the text of the Constitution, sponsored by gift back and give the Constitution on it, and it's a British ran for me last week that's really unique in our veneration for the constitution. We put on everything. Rarely, we fully understand its meaning. But there is this broad public culture of constitutional veneration, which James Madison says, grants with Geminis in the constitution. So that might explain part of it. I think that, again, sort of helpful and understanding the longevity of the Constitution, but all given different story here. So what I think is that more often, we see that nationally salient political issues, national concept, constitutional controversies are often pushed on the states in ways that bring about a constitutional change and prevent change to the National Constitution, that we see issues could be resolved at national level, instead of being resolved at the state level, preventing change to the national constitution bringing about a constitutional level. So I'm going to try to break that down a little bit, explain what this process looks like. And to give a broad theory and a little bit of evidence, giving an overview of that before I give you short stories on how this process so in the book, I have this four part typology. I'm gonna go through the nuts and bolts. But we can imagine that a national political issues emerge at the national level and result only a national reform and this occurs at the Constitution Center, something that can be resolved at the state levels. States, for example, cannot raise armies and navies are forbidden from doing it. And largely they don't talk to us at 91 State Constitution creates a Kentucky maybe there's no real reason for that. And it's also constitutional for the most part, that kind of thing doesn't actually happen. Instead, you know, we see a lot of issues involving the states, in areas that are kind of subject to overlapping regulation under the 10th. Amendment, these broad powers and it says that powers that are granted to the federal government are reserved to the States. extensors have ever been in the states can be regulated at the state level. And what this means is that the states and the federal government regularly have a lot of issues together. So we can imagine an issue that's nationally salient emerges at the national level, and then it gets pushed down to the state level. In the 1970s 80s and 90s, there was this big gigantic tax balanced budget movement, which trailed largely in Congress but created all these state level reforms restricting a bunch of Indian taxation house.