See Book of Mormon, 1830 ed., 487–488 [3 Nephi 16:10–12]; and the editorial note preceding the entry for 11 Mar. 1845.
On 1 March 1845 President John Tyler signed a “Joint Resolution for Annexing Texas to the United States.” Leading up to that resolution, Congress and the national press vigorously debated the question of Texas annexation and whether such an action would lead to war with Mexico or England or both. By 10 March 1845 Mexican government officials viewed the U.S. decision to annex Texas as a declaration of war. According to the Washington DC Daily National Intelligencer, the Mexican minister to the United States, Juan Almonte, wrote to Secretary of State James Buchanan that he considered the resolution to annex Texas “an act of aggression” against Mexico. Early rumors of the annexation were reported in Nauvoo by 11 March. Confirmation likely reached Nauvoo shortly thereafter; the day following this 18 March council meeting, the Nauvoo Neighbor included a report of the annexation. (Joint Resolution for Annexing Texas to the United States [1 Mar. 1845], Public Statutes at Large, 28th Cong., 2nd Sess., res. 8, pp. 797–798; “The Texas and Oregon Questions,” New York Herald, 30 Jan. 1845, [2]; “Highly Important from Europe,” New York Herald, 17 Feb. 1845, [2]; “Proceedings in Congress,” Daily National Intelligencer [Washington DC], 1 Mar. 1845, [2]; Council of Fifty, “Record,” 11 Mar. 1845; “The United States and Mexico,” Daily National Intelligencer, 10 Mar. 1845, [3]; News Item, Nauvoo Neighbor, 19 Mar. 1845, [2].)
The Public Statutes at Large of the United States of America, from the Organization of the Government in 1789, to March 3, 1845. . . . Edited by Richard Peters. 8 vols. Boston: Charles C. Little and James Brown, 1846–1867.
New York Herald. New York City. 1835–1924.
Daily National Intelligencer. Washington DC. 1800–1869.
Nauvoo Neighbor. Nauvoo, IL. 1843–1845.