What basis did Andrew Jackson claim Texas was part of the US?

Andrew Jackson claimed Texas was part of the United States based on the concept of Manifest Destiny, which held that the U.S. was destined to expand across the continent. He emphasized the historical ties between the territories, arguing that the annexation of Texas would fulfill America's mission to spread democracy and civilization. Additionally, he pointed to the fact that Texas had once been part of the Spanish and later Mexican territories, which the U.S. had acquired through earlier treaties and conflicts.