The beginning of Matthew 21 reveals that Jesus is indeed the King of the Jews. In fact, as He rides into Jerusalem, it is already foreshadowed that He is the King of all the nations. Matthew quotes from Zechariah 9 at least partly to demonstrate that Jesus is the Savior of the entire world--not every single person who ever lived, but a people from out of every tribe and nation and language. May Jesus Christ, the only true King, the King of all kings, be praised forevermore!