America is a fractured country ... but there might be someone who can heal the nation from inside the Oval Office -- Dwayne "The Rock" Johnson!!
That's according to Johnson's longtime friend, WWE legend The Undertaker ... who tells TMZ Sports he'd fully support Johnson running for the highest office in the land -- and won't be surprised if he actually throws his hat in the ring.
"That man works his tail off and he dives in wholeheartedly in everything that he does and if he gets his mindset that he wants to make a run at politics, ya know what?