Because Harry was the true master of the Elder Wand and wands will not kill their own masters. Further more, at that moment Harry owned ALL of the Deathly Hallows. He had the Invisibility Cloak already, then he acquired the Elder Wand when he won Draco Malfoy's wand at Malfoy Manor because the Elder Wand belonged to Draco since he was the one that disarmed Dumbledore, and finally, Dumbledore had left Harry the Resurrection Stone in the snitch. What is the one thing that kept being repeated about the Deathly Hallows? The one who possess them all at once becomes the master of death. Which is why, I believe, Dumbledore left him the stone in the first place.
Voldemort dies, Harry does not.
Yes, the dementors join Voldemort in Harry Potter and the Deathly Hallows.
Search for horcruxes so he can kill voldemort
Voldemort killed Snape.
Nobody, Lord Voldemort doesn't earn a wage.
Harry wins the battle of the Deathly Hallows in the fight between him and Voldemort, and Voldemort is defeated.
Yes, he does kill Lord Voldemort in the end of Deathly Hallows.
Voldemort dies, Harry does not.
harry kills voldemort!
harry killed voldemort
the final battle between harry and voldemort where harry kills voldemort
No, Harry Potter wins.
Yes, of course.
Yes, the dementors join Voldemort in Harry Potter and the Deathly Hallows.
Avada Kedavra
Voldemort dies at the end of Harry Potter and the Deathly Hallows because all his horcruxes have been destroyed.
The final death in Harry Potter and the Deathly Hallows is the death, and thus final defeat, of Lord Voldemort.