Major is known for her research into
social stigma and
psychological resilience. Specific subjects she has researched include the relationship between
abortion and mental health. For example, she chaired a 2008
American Psychological Association task force on the subject, which found major flaws in many of the relevant studies available at the time. The same panel found that the best available evidence indicated that a single abortion did not increase the risk of mental health problems relative to giving birth. She has also studied differences in
self-perception of one's abilities and performance between men and women. In 2016, she published a study showing that white Americans who identify strongly as white become more likely to support
Donald Trump in the
2016 U.S. presidential election if they are reminded that America's demographics are changing. Specifically, the participants in the study were reminded that whites are projected to become a minority in the United States by 2042. ==Honors, awards and positions==