What a country!

Nobody's stopping you using "whelmed". You can just start using it whenever the opportunity arises.

I use it occasionally, though normally not seriously, along with words where you have an "un" or "dis', but no positive equivalent, e.g. "gusting" as a positive "disgusting"

Whelm and overwhelm are synonyms.

The way I learned it, is that people have a tendency to emphasize, so when became overwhelmed. You see the same thing with 'good', 'great', and 'epic'meaning the same thing within certain contexts.

Also door jambs

Don't look up "let".

Just wait until you learn about 'set.'

Just as middle east and western Asia are the same region

It is from the POV of the original colonies.

No. It's from when the West was Nebraska and the Dakotas.

Midwest is not a place, it is a People.