Final answer:
In the 1940s, Langston didn't enter the library in Alabama because Black people were not allowed inside due to segregation laws.
Step-by-step explanation:
Langston didn't go into the library in Alabama in the early 1940s because Black people were not allowed to go inside back then. Segregation laws in the Jim Crow era enforced racial discrimination and prohibited African Americans from accessing public facilities, including libraries. This led to the creation of separate facilities like libraries for Black people.
Learn more about segregation and racial discrimination in library access in Alabama