When building 'the core' of the map. Is the order of the tiles random, or do they have to alternate City State/Natural Wonder?
Per the Advanced Map Building on page 14 of the rules, step 2 has you "take two random tilesthat have a natural wonder and two random tiles that have a city-state and shuffle all four together" (emphasis mine). Then in step 4 it says "Form the core by drawing and placing the core tiles, one at a time, into the center of the table" (again emphasis mine).
Based on creating a pile randomly and then drawing from that pile, it tells me that the order of the tiles are random.