It depends on what you mean by decline. In 1900 Britain was a lot more powerful on the international stage then it is today. I'd much rather live in Britain now though because even though it has "declined" living standards are a lot better in 2022 then 1900. I have concerns for the future of the U.S when it comes to politics and polarization. I don't think a future where the average living standards have increased in the U.S but we no longer are as dominant as we currently are in international relations and economics is a bad thing. It isn't our right to be a superpower and the largest economy in the world. I worry that other people in America don't share my view and if we "decline" it will be messy.