"Jesus clearly states in Matthew 24:14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come."
Read this text in its context,and this one as well(Luke 2:1),and may His Spirit give light.
Luke 2:1 And it came to pass in those days, that there went out a decree from Cesar Augustus, that all the world should be taxed.
"That all the world should be taxed -
Πασαν την οικουμενην, the whole of that empire. It is agreed, on all hands, that this cannot mean the whole world, as in the common translation; for this very sufficient reason, that the Romans had not the dominion of the whole earth, and therefore could have no right to raise levies or taxes in those places to which their dominion did not extend. Οικουμενη signifies properly the inhabited part of the earth, from οικεω, to dwell, or inhabit. Polybius makes use of the very words in this text to point out the extent of the Roman government, lib. vi. c. 48; and Plutarch uses the word in exactly the same sense, Pomp. p. 635. See the passages in Wetstein. Therefore the whole that could be meant here, can be no more than that a general Census of the inhabitants and their effects had been made in the reign of Augustus, through all the Roman dominions." Clarke
Re: Matt. 24:14
World (τη οικουμενη)
Lit., the inhabited. The whole habitable globe. Revised, in margin, inhabited earth. -Vincents Word Studies
and then shall the end come -
When this general publication of the Gospel shall have taken place, then a period shall be put to the whole Jewish economy, by the utter destruction of their city and temple.
As Jesus prophesied,so it was in AD 70.
Matt. 24:14
"This Gospel shall he preached in all the world - Not universally: this is not done yet: but in general through the several parts of the world, and not only in Judea And this was done by St. Paul and the other apostles, before Jerusalem was destroyed. And then shall the end come - Of the city and temple. Josephus's History of the Jewish War is the best commentary on this chapter. it is a wonderful instance of God's providence, that he, an eye witness, and one who lived and died a Jew, should, especially in so extraordinary a manner, be preserved, to transmit to us a collection of important facts, which so exactly illustrate this glorious prophecy, in almost every circumstance. Mar_13:10." - John Wesley
Even C.I. Scofield in his reference notes has this note:
world - Greek, "oikoumene" means "inhabited earth".
And again, Scofield on Luke 2:1 has this note:
Luk 2:1
world
(Greek, "oikoumenē", means "inhabited earth"). This passage is noteworthy as defining the usual New Testament use of oikoumene as the sphere of Roman rule at its greatest extent, that is, of the great Gentile world-monarchies (Dan_2:7). That part of the earth is therefore peculiarly the sphere of prophecy.
A. Barnes on Matt. 24:14
"And this gospel of the kingdom shall be preached in all the world -
The evidence that this was done is to be chiefly derived from the New Testament, and there it is clear. Thus Paul declares that it was preached to every creature under heaven Col_1:6, Col_1:23; that the faith of the Romans was spoken of throughout the whole world Rom_1:8; that he preached in Arabia Gal_1:17, and at Jerusalem, and round about unto Illyricum Rom_15:19. We know also that He traveled through Asia Minor, Greece, and Crete; that he was in Italy, and probably in Spain and Gaul, Rom_15:24-28. At the same time, the other apostles were not idle; and there is full proof that within thirty years after this prophecy was spoken, churches were established in all these regions.
For a witness unto all nations - This preaching the gospel indiscriminately to “all” the Gentiles shall be a proof to them, or a witness, that the division between the Jews and Gentiles was about to be broken down. Hitherto the blessings of revelation had been confined to the Jews. They were the special people of God. His messages had been sent to them only. When, therefore, God sent the gospel to all other people, it was proof, or “a witness unto them,” that the special Jewish economy was at an end.
Then shall the end come - The end of the Jewish economy; the destruction of the temple and city."
Soli Deo Gloria...Jesus' prophecy here was fulfilled!