Identify the nations involved when World War 1 started in 1914. What were the two alliances called? *free points* I don’t need help lol have a great rest of your day :)

How did the united states respond when north vietnam attacked a us warship and sent troops to south vietnam in the early 1960s? a.the united states declined to assist south vietnam against the north. b.us leaders authorized south vietnam to invade north vietnam. c.the president did not sign the gulf of tonkin resolution. d.congress authorized the president to escalate the conflict.