Drop in the bucket of this countries history and, in the end, nothing’s going to be done. Significant portion of our population still believes this was a good thing. Of those that even remember this that is.
Significant portion || of those that even remember this || that is.
The “that is” is a clarifier, similar to “is what I meant”.
Significant portion of our population still believes this was a good thing. Of those that even remember this, is what I meant.