U.S.A. Mathematical Olympiad Eligibility

In order to be eligible to take the USAMO, a participant must be either a citizen of the United States or a legal permanent resident. This rule was put in place after at least one instance of a Canadian student winning the USAMO in the early 90s, and the rule has been relaxed again in recent years to allow Canadians and international students to take the test. Only US residents and citizens may join the American IMO team. In addition, all participants, regardless of geographic location, must meet qualification indices determined by previous rounds of the AMC contests. Entry to the USAMO is by invitation only.