Daniel 2:40

40 Following that kingdom, there will be a fourth one, as strong as iron. That kingdom will smash and crush all previous empires, just as iron smashes and crushes everything it strikes.

Daniel 2:40 Meaning and Commentary

Daniel 2:40

And the fourth kingdom shall be strong as iron
This is not the kingdom of the Lagidae and Seleucidae, the successors of Alexander, as some have thought; for these are designed by the thighs in the third kingdom; and, besides, the kingdom of Christ was to arise in the time of this fourth kingdom, which it did not in that; nor the kingdom of Gog, or the empire of the Turks, as Saadiah, Aben Ezra, and Jarchi; but the Roman empire, which is compared to iron for its strength, firmness, and duration in itself; and for its power over other nations; and also for its cruelty to the Jews above all others, in utterly destroying their city, temple, and nation: forasmuch as iron breaketh in pieces and subdueth all things;
so this kingdom has subdued and conquered all others; not the Jews only, but the Persians, Egyptians, Syrians, Africans, French, Germans, yea, all the world: and as iron that breaketh,
or "even as iron breaketh all these", shall it break in pieces, and bruise;
all nations and kingdoms; hence Rome has been called the mistress of the world, and its empire in Scripture is called the whole world, ( Luke 2:1 ) ( Revelation 17:18 ) .

Daniel 2:40 In-Context

38 He has made you the ruler over all the inhabited world and has put even the wild animals and birds under your control. You are the head of gold.

39 “But after your kingdom comes to an end, another kingdom, inferior to yours, will rise to take your place. After that kingdom has fallen, yet a third kingdom, represented by bronze, will rise to rule the world.

40 Following that kingdom, there will be a fourth one, as strong as iron. That kingdom will smash and crush all previous empires, just as iron smashes and crushes everything it strikes.

41 The feet and toes you saw were a combination of iron and baked clay, showing that this kingdom will be divided. Like iron mixed with clay, it will have some of the strength of iron.

42 But while some parts of it will be as strong as iron, other parts will be as weak as clay.