Question

2014 jeep grand cheerokee overland 4wd 3.6 aut.

rear power lifgate no open manually or remote control or with the rear interior switch

Odometer
111,000

Answers

It's probably the liftgate strut that has gone. Especially if it was working very slowly and then it completely stopped working. 

I would also check the fuse for the liftgate, first.