The key signature does not differentiate Major or Minor key. 99.99999% of time, Minor key seldom appears in its natural form. Usually the melodic or harmonic minor keys are used in music. And both forms contain a leading note (raised 7th). Major key does not need to do so because the 7th note is already raised. So if you found one note is sharped frequently and that is the leading note of the related minor key, the piece is likely in the minor key.
For example, if to know if the piece is A minor, look for appearance of G# in the piece.
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