@Gordon's answer will keep mentioned countries in the last.
You need to use case expression as follows:
order by (case when country in ('United States', 'Germany', 'France') then 0
else 1
end),
country
If you want specific order within the mentioned countries then use multiple when as follows:
order by (case when country = 'United States' then 0
When country = 'Germany' then 1
When country = 'France' then 2
else 3
end),
country
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