Why is this the answer?

The answer is prince because this clever riddle uses special words to tell the story of a person in a royal family who is waiting for his turn. Let us look closely at the first line. It says, "I cannot be other than what I am, until the man who made me dies." Think about a prince. A prince is the son of a king, who is often called his father. In a kingdom, the prince is next in line to rule. As long as his father is sitting on the throne as the king, the son must remain the prince. He cannot change his role and become the new king until his father is no longer in charge. This is the main reason why the prince must wait for his chance. The next part of the riddle is a huge clue: "Power and glory will fall to me finally." Who has the most power and glory in a kingdom? The King does! This tells us that the person in the riddle will eventually wear the crown. A prince is the one who is next in line to the throne, so he is the one who is waiting for this great honor to come to him. The last line finishes the puzzle perfectly: "Only when he last closes his eyes." This is a kind and older way of saying "when the king dies." When the old king passes away, the prince's time to wait is over. He steps up and takes his father's place, finally receiving the kingdom, the power, and the glory. The riddle is all about the special and important situation of a prince who must wait to become a king. It describes the long wait for the day of his coronation.