Answer:
White settlers marched further westward towards the Pacific, inspired by the concept of Manifest Destiny, which believed that European Americans were divinely destined to occupy the whole North American continent. As they did so, they increasingly clashed with Native American Indians for land and natural resources, particularly when the discovery of gold in western regions triggered the Gold Rush. Prospective gold miners flocked to the Rocky Mountains and Pacific Northwest, fighting – often violently – with the Native Americans they met.
D) American citizens wanted to stay neutral until the innocent were killed.
A. The US made the Gadsden Purchase.
The US never sold Texas. US won the war. Mexican cession was the US taking land.