1) ‘I’ll make a fine Nation of you, or I’ll die in the making!’
2) “I’ve come back,” he repeated; “and I was the King—me and Dravot—crowned Kings we was!
3) “I am telling you as straight as I can, but my head isn’t as good as it might be.
Explanation:
The first one is about his plans on becoming the new king, and to do that, he won't let anything get on his path to rule the whole kingdom, and if it does, he's capable of dying to get there.
The second one is an illusion, something that was happening only on his mind after drinking too much, but he realizes it after that.
The last one is a suffering, he is suffering for a specific reason that is pretty much influencing him to feel sad at the moment.