Final answer:
Martin Luther King, Jr. identifies Birmingham's history of racial segregation and civil rights struggles, as well as the encouragement of patience by white religious leaders, as two details that make Birmingham unique among U.S. cities in his "Letter from a Birmingham Jail."
Step-by-step explanation:
In his "Letter from a Birmingham Jail," Martin Luther King, Jr. identifies two details that make Birmingham unique among United States cities. Firstly, Birmingham has a history of racial segregation and civil rights struggles, with the campaign in Birmingham attracting significant attention due to the violent response from the police towards peaceful protests. Secondly, the letter mentions how Birmingham's white religious leaders encouraged patience and gradual change rather than immediate justice, which King criticizes in his letter.