There are four regions with more than one million records total. Should I create a table with a region column or a table for each region and combine them to get the top ranks?

If I combine all four regions, none of my columns will be unique so I will need to also add an id column for my primary key. Otherwise, name, accountId & characterId would be candidate keys or should I just add an id column anyways.

Table:
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| name | accountId | iconId | level | characterId | updateDate |
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