D&C 38:29-32, dated January 2, 1831, speaks of future wars in the USA.
Section 38:29-32, Doctrine and Covenants, The Church of Jesus Christ of Latter-day Saints, accessed August 2, 2024
29 Ye hear of wars in far countries, and you say that there will soon be great wars in far countries, but ye know not the hearts of men in your own land.
30 I tell you these things because of your prayers; wherefore, treasure up wisdom in your bosoms, lest the wickedness of men reveal these things unto you by their wickedness, in a manner which shall speak in your ears with a voice louder than that which shall shake the earth; but if ye are prepared ye shall not fear.
31 And that ye might escape the power of the enemy, and be gathered unto me a righteous people, without spot and blameless—
32 Wherefore, for this cause I gave unto you the commandment that ye should go to the Ohio; and there I will give unto you my law; and there you shall be endowed with power from on high;