The Wikipedia already pointed out that the Spanish and Americans settled regions 2 and 3 with ilocanos and tagalogs in 18th to 20th centuries.
I have none regarding the famine, many of the sources have been put down now.
You can't trust Wikipedia for everything, please give us actual secondary sources to understand this. Give us titles of books and articles, names of authors who have written these articles, that we too may understand more of Filipino history, enough to actually understand this period.