[ForHackernews]

> after which we don't have buffers

The "buffers" are two massive oceans, those are not going anywhere for the next million years.

Russia can't sustain an invasion of its next door neighbor. There is zero chance of a hostile invasion of the mainland United States.

[JumpCrisscross]

> "buffers" are two massive oceans, those are not going anywhere for the next million years

There are also nukes. Nobody is invading America any time soon. But losing that security space means conceding a massive chunk of our GDP and, with it, autonomy and quality of life. At the very least, the system of government that oversaw that failure would be replaced.