Santa has existed for hundreds of years but a few things don't add up so allow me to fill in the gaps.
1 How does Santa have a near infinite supply of Elves?
Explanation: That is a good question, when you think about it, at first glace it makes no sense. Santa and his Elves are isolationists expect when Christmas eve begins. So being isolationists, Santas Elves would only have so much genetic diversity.
Lets say you locked 200 people in a house for 500 years. You have them enough food and water to last for 1000 years. You come back 200 years later and they are all dead, why? Because to breed you need genetic diversity. If you slowly run out of it. ( Like Sanatas Elves are ) eventually it becomes difficult to produce babies. So right now an Elven baby is very rare. So how does Santa get more Elves?
His naughty and nice list is how he does it. If you are naughty he drags you into his sack and takes you back to his Hq in the North pole. He and his "Elves" then indoctrinate you to make you think you are an elf!
2 Fun fact
Santa pays his "Elves" nothing and imprisons them if they refuse to make more toys. He works them tirelessly with most dying within a month.
3 Who is Santa and what is his agenda?
Santa is a robot sent to Earth by evil aliens to indoctrinate the children of earth! Santa gives you gifts, yes. But when you get those gifts they slowly make you greedy. 90 percent of recent wars were caused by Santa. Obama, Putin Kim, all those guys and more are puppets controlled by Santa!
How did Santa get his reindeer?
Reindeer used to a renegade group of Elves trying to take down Santa. Santa captured them and tortured them. In return for their lives he made them into reindeer they shall be his thralls for all eternity.