United States of America Mathematics Olympiad, part of a worldwide system of national mathematics competitions. Qualifier for the U.S. mathematics team.

The USAMO is a six-question, six-hour essay/proof examination. All problems can supposedly be solved with pre-calculus methods. Approximately 200 of the top scoring AMC (AHSME+AIME) participants (based on a weighted average) are invited to take the USAMO. Participation in the USAMO is limited to American citizens or permanent residents. In other words, those seeking citizenship and currently possessing a U.S.A. Immigration green card.

The twelve top scoring USAMO students are invited to a two day Olympiad Awards Ceremony in Washington, DC sponsored by the MAA, the Micros~1 Corporation and the Matilda Wilson Foundation. Six of these twelve students will comprise the United States team that competes in the International Mathematical Olympiad (IMO). The IMO began in 1959; the USA has participated since 1974.

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