In each group, name any answer which matches the first category to reveal the second category, then name any answer which applies to both categories to reveal a third, and so on.
Made the mistake of trying to think of states near Louisiana for those included the Louisiana purchase; I had no idea it was such an enormous swathe of territory.
This is regardless of how landlocked is defined. It does not satisfy the Canada clue and so is not valid for the landlocked one. That's how category eliminations work, it must satisfy all prior clues in that colour
Nice one as usual 👍🏻