Final answer:
The National FFA Foundation's historic milestone in 1979 was the first National FFA Convention with female member participation, a key step in gender equality in agricultural education.
Step-by-step explanation:
In 1979, the National FFA Foundation achieved a historic milestone by hosting the first National FFA Convention where female members were allowed to participate, marking a significant step towards gender equality in agricultural education. The National FFA Organization, formerly known as Future Farmers of America, had previously allowed only male members since its inception. However, the change reflected a broader movement towards inclusivity and women's rights, resonating with other historical events of the time, such as the women's suffrage movement led by figures like Mott and Stanton and parallels with organizations such as the Colored Farmers' National Alliance which formed in response to exclusionary policies.