I don't know exactly. I would assume that it's based on funding limitations. There are 634 first nations communities in Canada, and only 20% of them receive aboriginal head start funding from Health Canada.
We didn't visit all of those communities, but we did see evidence that when there is an aboriginal head start program, children are more ready to learn when they arrive in kindergarten. So that kind of investment—one factor among many—could make a significant difference in educational outcomes for first nations children.