Question: The Old Federal Building in Fairbanks was built by William "Mac" MacDonald, who also later built the Federal Building in a city that was incorporated on what date?
{'answer': 'April 9, 1901', 'supporting_facts': [['Old Federal Building (Fairbanks, Alaska)', 0], ['Old Federal Building (Fairbanks, Alaska)', 6], ['Nome, Alaska', 0], ['Nome, Alaska', 3]]}