The main power line for the starter runs from the battery to the starter solenoid which can be part of, or separate from the starter and is never fused - the starter draws from 120-200 amps.
I don't know why but Jeeps **** in the starter department; we have several in the family and it is not uncommon for oil to seep into the starter housing and catch enough junk over time to insulate the starter commutator which puts them out of action.
If you have checked the lead going from battery to solenoid to starter and they are all clean and secure, the starter is probably not contacting at the internal brushes any more.
With the car in neutral or park and the handbrake firmly on, take jumper cables and use one side connected to the battery postitive to bypass the solenoid and tap the other end on the starter terminal to see if it responds.
DON'T clip it on and be ready to be startled by the shower of sparks you might get while tapping if the starter will still draw current.
If it doesn't spark, then the brushes aren't contacting the armature any more.
These can be disassembled and cleaned but it may be easier to trade it for a remanufactured one.
I would check both locations but would "guess" under the hood first.
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