"And the angel said unto her, Fear not, Mary: for thou hast found favour with God. And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS. He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David: And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end." - Luke 1:30-33 KJV

JESUS brought His kingdom on earth. Isaiah prophesied of this.

"For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace." - Isaiah 9:6 KJV

"Of the increase of his government and peace there shall be no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever. The zeal of the LORD of hosts will perform this." - Isaiah 9:7 KJV

Jesus would establish His kingdom on earth by the gospel. (His death, burial, and resurrection).

The Father robed Himself in flesh and blood to take our place, facing judgment and justice for our sin. God established His kingdom with judgment and with justice by the death of this child that was born, this son that was given, which is the Father’s body, called by the Father's name JESUS. (Luke 11:2, John 5:43). God’s human body that He dwelt in was of the lineage of king David. God’s kingdom of peace would be everlasting.

The Father brought peace between mankind and Himself by the holy sacrifice of His body. (Acts 20:28, Hebrews 2:14-15).

"To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them" - 2 Corinthians 5:19a KJV

"And, having made peace through the blood of his cross, by him to reconcile all things unto himself" - Colossians 1:20a KJV

What is His kingdom?

"For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost." - Romans 14:17 KJV

How do we enter His kingdom?

"Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God." - John 3:5 KJV

We enter the kingdom of God by water baptism in Jesus name for the remission of sins, and by Spirit baptism by receiving the gift of the Holy Ghost, speaking in tongues as the Spirit gives us the utterance. (Acts 2:4, Acts 10:45-46, Acts 19:6). This is our peace with God.

"Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call." - Acts 2:38-39 KJV

"And she shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins." - Matthew 1:21 KJV

"Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved." - Acts 4:12 KJV