I kind of expect these to be negotiable. Take back some unwanted people, get the ban lifted?

Well there you go...

I had no idea. 

I do know that western countries take issue with people from Fujian province China. Apparently they're known for overstaying visas.

Immigrants from both countries have high rates of welfare handouts, I think it's at least 40 percent


Bell_curve

It is talked about in the WH post I linked:

(i)   According to the Overstay Report, Burma had a B‑1/B-2 visa overstay rate of 27.07 percent and an F, M, and J visa overstay rate of 42.17 percent.  Additionally, Burma has historically not cooperated with the United States to accept back their removable nationals.

(ii)  The entry into the United States of nationals of Burma as immigrants and nonimmigrants is hereby fully suspended.

(i)    According to the Overstay Report, Laos had a B‑1/B-2 visa overstay rate of 34.77 percent and an F, M, and J visa overstay rate of 6.49 percent.  Laos has historically failed to accept back its removable nationals.

(ii)   The entry into the United States of nationals of Laos as immigrants, and as nonimmigrants on B-1, B‑2, B-1/B-2, F, M, and J visas, is hereby suspended.

(iii)  Consular officers shall reduce the validity for any other nonimmigrant visa issued to nationals of Laos to the extent permitted by law.

Politics_And_Law

Trump Bans Citizens Of 12 Countries From Traveling To The US

optimism

It is talked about in the WH post I linked:

**Myanmar** (as Burma)
> (i)   According to the Overstay Report, Burma had a B‑1/B-2 visa overstay rate of 27.07 percent and an F, M, and J visa overstay rate of 42.17 percent.  Additionally, Burma has historically not cooperated with the United States to accept back their removable nationals.
> (ii)  The entry into the United States of nationals of Burma as immigrants and nonimmigrants is hereby fully suspended.

**Laos**
> (i)    According to the Overstay Report, Laos had a B‑1/B-2 visa overstay rate of 34.77 percent and an F, M, and J visa overstay rate of 6.49 percent.  Laos has historically failed to accept back its removable nationals. 
> (ii)   The entry into the United States of nationals of Laos as immigrants, and as nonimmigrants on B-1, B‑2, B-1/B-2, F, M, and J visas, is hereby suspended.
> (iii)  Consular officers shall reduce the validity for any other nonimmigrant visa issued to nationals of Laos to the extent permitted by law.