Helaman 14: 2-7
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.
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.
Therefore, there shall be one day and a night and a day, as if it were one day and there were no night; and this shall be unto you for a sign; for ye shall know of the rising of the sun and also of its setting; therefore they shall know of a surety that there shall be two days and a night; nevertheless the night shall not be darkened; and it shall be the night before he is born.
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.
And it shall come to pass that ye shall all be amazed, and wonder, insomuch that ye shall fall to the earth.
What were some of the signs of Christ's birth show to those in the America's?
Luke 1: 26-33
And in the sixth month the angel Gabriel was sent from God unto a city of Galilee, named Nazareth,
To a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin’s name was Mary.
And the angel came in unto her, and said, Hail, thou that art highly favoured, the Lord is with thee: blessed art thou among women.
And when she saw him, she was troubled at his saying, and cast in her mind what manner of salutation this should be.
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:
Who came to tell Mary she would have a baby?