Answer:
Both the Zimmermann Telegram and British Sinking of the Lusitania.
But, mostly the Zimmermann Telegram
Explanation:
Americans started to hate the war (woo go peace core) and eventually we left Vietnam and Johnson didn't try his luck for getting his second term lol
"<span>The Union desired to push the Native Americans off of their land to further the expansion West" would be the best option from the list, since both sides knew that their future relationship would not last in any meaningful way. </span>
