The answer to that question will depend crucially on what you mean by Feudalism. It was not an observable thing, nor a contemporary descriptive category that fell out of use. Can you be more specific about what you mean by feudalism, which might then help us answer what led to its end? For instance, are you describing a system of political and military relationships? An economic system based on landownership? A system of social class relations? The answer is going to vary from "it never existed" to "it hasn't ended yet" depending on what exactly you are referring to.