Who was significant in the integration of schools and was instrumental in various community efforts?

The individual significant in the integration of schools and instrumental in various community efforts is Sadie Tanner Mossell Alexander. She was a prominent figure in the early 20th century, known not only for her role as an attorney and the first African American woman to earn a Ph.D. in economics in the United States but also for her tireless advocacy for civil rights and education reform.

Alexander's work extended beyond her academic achievements; she was passionately involved in community service and played a vital role in organizations that supported African American education and civil rights. Her commitment to integrating schools and providing equitable educational opportunities was part of a larger movement influenced by her understanding of the systemic barriers faced by African Americans. Through her involvement with various organizations, she pushed for social justice and made significant strides in addressing educational inequities.

In contrast, while the other individuals listed made noteworthy contributions in their fields, they may not have had the same direct impact on school integration and community activism as Alexander did.