general_fact: 538 is the total number of votes in the Electoral College of the United States.
math_fact: 538 is the 10^{th} open meandric number.
trivia: 538 is the total number of votes in the Electoral College of the United States.
historical_date: June 21st is the day in 1788 that New Hampshire ratifies the Constitution of the United States and is admitted as the 9th state in the United States.