E. Peterbus Unum is episode 18 of family guy season 02. It was originally aired on July 12, 2000.
When his neighbors gets such a large tax refund, Peter decides to use his for a swimming pool, only to learn he isn’t entitled for a refund. Disappointed when he learns that city codes forbid pools in his area after trying to build one, Peter decides to fight City Hall. When he discovers that there is no record of his property in the city records, he declares his land a country and makes himself the president.