How is santa associated with reindeer and sleigh?

Because he rides in a sleigh that is pulled by eight (...nine, if you count Rudolph...) reindeer on his way to deliver the presents.

AnswerHistory states a real man existed that delivered wooden toys he made to the children of his area. The sleigh was pulled by reindeer, simalar to the deer we see in the U.S AnswerThere was a man named Jolly Old Saint Nick. He delivered toys to children and he had a wagon pulled be some sort of animal. So they got Santa from Saint Nick and they got the sleigh pulled by reindeer from the wagon pulled by animals.
To pull his sley at Christmas Eve