Fewer Spectrum's of all models combined appears to have been sold than the C64 alone, so it dominated very few places.
They had high market shares in countries with much smaller populations than the US, so in terms of number of countries (particularly in Europe and South America), it dominated in far more of them than the C64 did.
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They had high market shares in countries with much smaller populations than the US, so in terms of number of countries (particularly in Europe and South America), it dominated in far more of them than the C64 did.