If a 10 year old child should walk up to you and ask you which hand the wedding ring is worn, you probably will be able to say but if he/she should ask why would definitely put you off balance.
The story of why the wedding ring is worn on the left hand can be traced back to ancient times.
In that era, the Romans believe that the vein in the right finger (4th finger) on the left hand ran directly to ones heart.
Because of that believe, they called that vein the “vein of love”.
Naturally, to solidify a union based in love, they’ll place the ring on that fingertips housed the vein of love to signify the romance that’s between a couple.