The US spends more on healthcare than arms.

You could argue for lower defense spending, but there’s a hard lower limit (which is unknown) and if you cross that threshold, the world changes for the worse very quickly.

The rules-based order is underpinned by tanks and planes and nukes. Diplomacy is a layer of abstraction over violence and potential violence.

Medicare costs $800 billion/year and only covers 20% of the population. They are on average the most expensive 20%, but I doubt you’re going to cover all the rest for another $200 billion.

Medicaid is another almost $1 trillion/year.