As Ben Schmidt, assis­tant pro­fessor of his­tory at North­eastern Uni­ver­sity, has shown in a series of great graphs, women’s choices of major really explain most of the drop. Starting in the late 1970s, women became the majority of the under­grad­uate stu­dent body at col­leges and uni­ver­si­ties in the United States. By the 2000s, women made up around 57 per­cent of under­grad­u­ates. Women’s deci­sions became increas­ingly impor­tant, and those choices started to change radically.

 

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