Why did the US covet the Southwest so much, and what were their ambitions?

Extend the nation

Explanation:

The United States desired to take the Southwest because they wanted to extend their rule towards the Pacific. Railroads played a crucial role in the Southwest when it came to people to move in the region for starting a new life. The Transcontinental Railroad in the 1800s changed the situation of the economy and social condition of America. New industries in the Southwest during the 1890s, especially in agriculture and mining, attracted many migrants.

"the gulf of tonkin resolution in 1967".

the gulf of tonkin resolution (officially called southeast asia resolution, public law 88-408) is a law issued by the congress of the united states of america on august 7, 1964, in which president lyndon b. johnson was authorized1 to act in a comprehensive manner against the democratic republic of vietnam, which he accused of aggressions against us ships in the gulf of tonkin, where the resolution takes its name. the gulf of tonkin resolution is of historical importance because it gave authorization to the us president. lyndon b. johnson, without a formal declaration of war by congress, to use military force in southeast asia.