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@bill_brown explains this well, I think.
In todays chord progression we are playing 2nd inversion triads (of the C master shape) on the loE, A & D string set. The open G string is being used as a drone and isn’t part of the chord. Every note played on the loE string is a 5th, every note played on the A string is a root, and every note played on the D string is a 3rd – some will be major 3rds and some will be minor 3rds – it’s the 3rd that makes a chord major or minor.
The chord triad names are as follows;
C = 332XXX, Dm = 553XXX, F = 887XXX, Em = 775XXX, Am = 12 12 10 XXX, and G = 10 10 9 XXX.
Can you see the difference between the major and minor 3rds played on the D string?