What led president johnson to go to war against north vietnam?

The US wanted to stop the spread of communism. Our president felt if North Vietnam spread communism to south Vietnam it would eventually spread to other countries, then into the world and eventually over to the US.

hello there, can you add the "following" multiple choices

we can argue that appeasement caused world war ii because it allowed hitler and the nazis to build germany’s military power until it was strong enough to fight a major war. additionally, appeasement emboldened germany, making it think the allies would never have the will to fight. this made germany much more aggressive and encouraged it to take the steps that eventually led to war.