It was groundbreaking because it was funny and educational and approached modern topics in a way that was accessible to children, yet it wasn't offending anyone. It was one of the first show whose educational effects on children were studied and it is considered to be a very positive show and a good thing to watch. The long term impact is that it created a legacy of a hundred million people watching the show in their lifetime, usually when children.
feudalism: system of rule by local lords with ties of loyalty to a king.
Feudalism in Western Europe was similar to feudalism in Japan in that: power was based on class relationships.
Hope this helps.
