Nobody knows with 100% certainty, who the owners of these pools are and where they are operating from... There are still some large American Bitcoin farms out there, but
from what I have picked up, many are not profitable and might need to close shop after the Halving. The Chinese operations have the advantage with cheap electricity and if
a country outside of China could provide subsidized electricity for mining, they might draw a lot of income their way. A country with cold temperatures like, Alaska or Iceland or
even Canada.