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The tower unofficially became the world ’s tallest man-made structure in April , 2008 after surpassing the ( 628.8 metres ) in North Dakota in the United States .
 North Dakota, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 North Dakota, United States