Answer :
Many Americans believed that Texas - as well as other parts of Mexico - should belong to the USA. They felt that the USA should extend from the Atlantic to the Pacific and that any Mexicans or Indians in between should be kicked out to make way for the "rightful" owners. This belief was called "Manifest Destiny." By 1830, the USA had taken Florida from the Spanish and the central part of the nation from the French (via the Louisiana Purchase). Political leaders such as Andrew Jackson officially disowned rebel actions in Texas but covertly encouraged Texas settlers to rebel, giving tacit approval of their deeds.
Answer:
Manifest Destiny was the belief that American expansion was destined to expand across the continent. Because of this attitude, Americans invited Texas to join the US as the 28th state in 1845. ... This was because American settlers in Texas refused to abide by Mexican laws that prohibited slavery in Texas