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Nan Madol, ancient capital of the Saudeleur dynasty that ruled Micronesia, is a fantastic example of megalithic architecture. It is an island city on Pohnpei that is completely artificial; approximately one hundred artificial islets surrounded by a sea wall and linked by canals. Somewhere between the early 16th Century and 17th Century, according to Pohnpeian legend, a man named Isokelekel invaded the city and overthrew the Saudeleur. He then ruled the island from Nan Madol; however, his descendants abandoned it, due in some versions to a sharp population decline, or to the city's lack of fresh water and the new decentralized system's inability to provide this water. My challenge to you, then, is keep this city occupied all the way up to 2014, and by occupied, I mean fully so. Butterfly away Isokelekel's invasion, keep the chiefs in Nan Madol, have European colonists take over the city, do whatever as long as it keeps the amazing Venice of the Pacific alive.
EDIT: You get an internet cookie if your mini-TL involves the Saudeleur still ruling the islands at least in name in the modern age.