Wow, how shortsighted.

> - NATO - Maintaining security on the high seas for other than USA shipping,

NATO consists of a lot of countries, why would they only work for USA shipping? And where do you think that shipping comes from?

> - tariffs imposed by other countries (yes, other countries have been imposing tariffs for decades):

Of course they do. But they're not usually idiots about it.

> The USA can use the money saved for its own citizens (possibly even lowering their taxes!)

You advocate for tariffs but don't understand how tariffs work...