Thanks for all the helpful comments Someemofag! A few comments and questions…
Yes, I made that chart, thanks for posting it here (I wasn’t sure how).
I did intentionally leave off Pure Land, Ch’an, Zen, and others. It seemed to me that these were many subcategories of Mahayana, springing off from it. There were so many that I thought it best to leave it at Mahayana. I DID put in Vajrayana (Tantric) since it is so often considered one of the major three branches (along with Theravada and Mahayana) - at least according to my limited understanding. Perhaps I should add in Pure Land, Cha’an, and Zen at least though.
I have heard that Vietnamese Buddhism is a blend of Theravada and Mahayana, but didn’t realize its development was as recent as the 1960s! However, I thought that Vajrayana (Tantric) WAS that Vietnamese Buddhism. Perhaps I’ve misunderstood this.
Another thing that now confuses me is that, in the chart you provided, they follow Vajrayana with ‘Tibetan’ in parentheses. This is most confusing to me since, as you can see from my chart, I had thought the two were distinct.
So now I am left wondering: Between TIBETAN, TANTRIC, VAJRAYANA, and VIETNAMESE Buddhism, which ones are distinct and which are simply different terms for the same school? Where do each belong on my chart I wonder?
Your notes on the history of Tibetan Buddhism were most interesting as well. Sometimes, based on his books I’ve read, I wonder if the Dalai Lama secretly wishes he were a Theravada Buddhist, as he never writes of the mystery side of Tibetan Buddhism (at least in his popular books published in the west, from which I’ve read).
As for Rinzai, Soto, and Wild Cat, I wonder how major these schools are/were and if it would be disrpoportionate to represent them on the chart without the, undoubtedly, countless other smaller schools? Maybe I’m totally wrong and these are major branches - I’m still learning.
America is quite the religious melting pot, and I think it remains to be seen what major school might emerge from this turmultuous maelstrome over here. There are even groups of Zen Christians and so on. I myself favor a more secular form of Buddhism (minus the mythos, ritual, supernatural stuff, etc.). But that’s just my initial impression. I have yet to make my first temple visit.
Thanks again for the comments 