2001 dodge stratus want start and the alternator and starter have been replaced .

Have the battery load tested by a shop or parts store (free testing there). I am sure you have a defective battery or a failed engine alternator.

When you use the ignition key you activate both the starter and ignition circuits. When you jump the starter motor all you do is crank the engine - you have not energized the ignition so car will not start.

Check starter relay and kick starter

Change all your relays,especially in the engine bay,check your idler control valve/servo for faulty or short circuited.Also check all the fuse boxes for contamination,Spray with circuit board cleaner or something similar.

If you are saying it will not crank, the engine could be locked up.
A mechanic would try turning the crank by using the alternator pulley.

try with the second key

try another battery and see what happens.check your alternator and starter.

the starter is the most often cause of the failure the solonoid gets shorted and blows the fuse replacing the starter should fix it, i have also seen a couple of wires for the starter rub against the heat shield and blow the fuse

Cut the insulation back on the negative cable & look for green corrosion. If so replace the cable. Try that.

did you check the fuseable link wire going from the starter to the alternator