Concurring opinion is when one or more agree
unanimous opinion is when means almost everyone (or everyone) agrees
i.e:
you have to get a box into the house
out of 5 people, 1 person thinks you should hire someone to do it; that's a concurring opinion
out of 5 people, all 5 think you should just carry it into your house, that's a unanimous opinion
James Madison because he drafted and promoted the US constitution
