sentences:  He was one of the first African Americans to have a recurring role on a kids' TV series, and his presentation – as both a beloved neighbor to Mister Rogers and as a respected authority figure – has been described as a ground-breaking message in race relations.For example, in 1969, when African-Americans were not permitted to swim in community pools alongside white people, Mr. Rogers invited Officer Clemmons to cool his feet with him in a small, plastic wading pool.Mr.