Opinions sought. I vaguely remember that the expression "This is right" (meaning "I agree with what you just said") appeared in the 1970s. And I remember it because, if I remember correctly, it replaced in no time the till-then familiar phrase "That's right". Forty years later, it's normal to see sentences like... this:
"...inflation reached 200 percent. This led to a major upheaval..."
...whereas, it seems better/more logical to use "...200 percent. That led to..." - because "this" suggests something that's coming (e.g. that example above), while "that" has more a sense of what just passed ("I'll catch this bus, I missed that bus").
But then, dictionary.com says "this" means "used to indicate a * just mentioned", while "that" is "used to indicate a * mentioned before". So "this" should be the first choice. But it sounds wrong to my ear.