How did Mary McLeod Bethune change African American relations during the 1920s – 1930s? A. She advised the Florida Democratic Party and helped promote voting among African-Americans. B. She helped African American males in receiving their business degrees, which stimulated the economy. C. She advised several presidents in this time period and became the first African American woman to head a federal agency. D. She was involved in the development of Florida's agricultural shipping routes that positively impacted the state's economy.