The latest research and statistics suggest that STEM fields will remain overrepresented by Asian and White males, and not due to factors (like unlawful discrimination) in the workplace.
The Gender-Equality Paradox: An unintuitive finding from recent research on adolescent achievement in science, mathematics, and reading (N = 472,242) is that as a country becomes more gender-equal and cultural influences on gender decrease (women are less restricted by societal norms and get to choose the career they want), differences in sex (like interest in people vs things) are maximized (Stoet & Geary, 2018).
“Falk and Hermle studied 80,000 individuals in 76 countries who participated in a Global Preference Survey and compared the data with country-level variables such as gross domestic product and indices of gender inequality. They observed that the more that women have equal opportunities, the more they differ from men in their preferences.” (2018) https://science.sciencemag.org/content/362/6412/eaas9899
Group Differences in Mathematics Achievement: There is a known disparity in academic achievement between groups, especially in mathematics. The disparity in the percentages of college-bound, male 12th graders with an Advanced level of math is difficult to ignore – 17% of Asian males achieve Advanced mathematics competency, while the percentage of black males who did the same is so low that it rounds to 0% (.22%; Nations Report Card, 2015).