Why have we assigned a negative charge to electrons (and positive for protons)?
I feel it would be easier if electrons were positive (thereby, protons negative)- electrons would flow in the direction of current rather than flowing in the opposite direction. Something that would make more natural sense.
Is there is a historical reason or just something we have overlooked and now it's too late to change it?
Or is there a compelling reason for this choice that I could not find over the web?