Final answer:
The exact date of the first National Agricultural Career Show is not specified in the references provided. However, the materials suggest that agricultural advancements and farmers' organizations, such as the Grange and the Atlanta Exposition, played similar roles in promoting agricultural careers during the late 19th century.
Step-by-step explanation:
The first National Agricultural Career Show does not have a specific mention in the provided references, implying that it was not a notable event during the periods addressed. However, the provided information highlights significant agricultural organizations and exhibitions related to the advancement of agricultural careers and interests, particularly in the post-Civil War period. Earliest efforts to organize farmers, such as the founding of the Grange in 1867, were crucial in advocating for better conditions and support for farmers.
The Atlanta Exposition of 1895 played a significant role in promoting technological and agricultural advancements in the Southern states, and while it is not explicitly called a 'National Agricultural Career Show', it served a similar purpose in highlighting agricultural progress and skills. Additionally, the promotional materials and banners from the Grangers in the early 1870s and the formation of the Colored Farmers' National Alliance in 1886 demonstrate the early focus on agriculture as a profession and the efforts to unify farmers for better opportunities.