Who falls into the Invincible Ignorance Category, and who doesn't?
People who are in contact with the Church but never join?
Native Americans before Europeans arrived?
God predestined the "Native Americans before Europeans arrived", to be born where they were. They are not "snatched" from His salvation. If God put them there it is for their own good. Hell has degrees of punishments, and the worst punishments are reserved for those to whom Jesus Christ was revealed. The worst degrees of punishments are for Catholics, and the worst of all for popes, bishops, priests.
If infants go to a part of hell with no sense pains (limbo of infants), a worldy paradise, it is possible that the pains of hell can start by degrees from there and end at the worst, for popes. For that reason I can say that "If God put them there it is for their own good", for had Christ been revealed to them, it wouuld have been worse for them.
St. Augustine: “If you wish to be a Catholic, do not venture to believe, to say, or to teach that ‘
they whom the Lord has predestinated for baptism can be snatched away from his predestination, or die before that has been accomplished in them which the Almighty has predestined.’ There is in such a dogma more power than I can tell assigned to chances in opposition to the power of God, by the occurrence of which casualties that which He has predestinated is not permitted to come to pass.
It is hardly necessary to spend time or earnest words in cautioning the man who takes up with this error against the absolute vortex of confusion into which it will absorb him, when I shall sufficiently meet the case if I briefly warn the prudent man who is ready to receive correction against the threatening mischief.” (On the Soul and Its Origin 3, 13)