If you knew Our Lord was coming, how would you prepare? The ancient inhabitants of Israel and America absolutely knew when the Messiah was coming; here’s an example of a prophecy:

America's Mount Zion1 And now it came to pass that Samuel, the Lamanite, did prophesy a great many more things which cannot be written.
2 And behold, he said unto them: Behold, I give unto you a sign; for five years more cometh, and behold, then cometh the Son of God to redeem all those who shall believe on his name.
3 And behold, this will I give unto you for a sign at the time of his coming; for behold, there shall be great lights in heaven, insomuch that in the night before he cometh there shall be no darkness, insomuch that it shall appear unto man as if it was day.
5 And behold, there shall a new star arise, such an one as ye never have beheld; and this also shall be a sign unto you. (Helaman 14)

Many of the signs are now in place, as the prophets foretold.

Looking Out From the Albright-Knox Art Gallery
Looking Out From the Albright-Knox Art Gallery