'''Airdate:''' July 12, 2000

A trip to city hall reveals that Peter's house is not on the Quahog map, so Peter (who has had it with the government not giving him a tax refund and telling him he can't build a pool around his house) decides to declare his house his own country -- which causes an international crisis when he invades Joe's backyard pool.

!!"E. Peterbus Unum" contains examples of:

* BuxomIsBetter: Susan Sarandon in her [[BigLippedAlligatorMoment out-of-nowhere]] appearance.
-->'''Susan Sarandon:''' For less than the ticket price of one of my movies about capital punishment or neo-feminism, you can make sure that Stewie never goes hungry again.
-->'''Stewie:''' Yes, and from the look of those sweater cows, so could you.
* ComicallySmallBribe: Peter attempts to get something from the U.S. while negotiating his surrender in an effort to save face, but Mayor West rejects each of his increasingly small demands, until he dejectedly asks for a single ordinary office pen; Adam West then describes at length how little the pen is worth, and still refuses.
* DiplomaticImpunity: "Just like the bad guy in ''Film/LethalWeapon2''/I've got diplomatic immunity, so [[Music/MCHammer Hammer]] you can't sue."
* DistantFinale: The episode turns out to be a video shown to a class 200 years in the future, where one of the students [[AudienceSurrogate asks if anyone understands Stewie]] (which was a common fan question. According to commentary, people do understand what Stewie says, but, because he's a toddler, they don't take him seriously).
* EarlyBirdCameo: When Lois tells Peter that a swimming pool is one of those things the family doesn't really need, we get a flashback of the last time Peter brought home something the family didn't need: another talking dog, who looked and sounded like a CampGay Brian. That dog would later be Brian's cousin, Jasper.
* EditedForSyndication: Syndication significantly shortens the scene where Mayor West eats some taffy (unlike most edits in syndication on ''FamilyGuy'', this was done because it was an OverlyLongGag that needed to be shortened, not because of anything offensive).
* {{Egopolis}}: Petoria.
-->'''Peter:''' I was gonna call it "Peterland", but that gay bar down by the airport already took it.
* EveryoneHasStandards: This episodes establishes Adam West as a complete whackjob, but he was the first one to say that Peter should not remain his own nation.
* ForeignerForADay: The town zoning map revealed that the Griffin's land was not even a part of the US. Thus was born the tiny, four-bedroom republic of Petoria (It would have been Peterland, but that was already the name of a gay club by the airport).
* KarmaHoudini: Played with and subverted. Peter believes because he's technically the president of his own country he can't be tried in America, it works until he decided to take over Joe's pool.
* LandOfOneCity: more like Land of One House.
* NakedPeopleAreFunny: Bill Clinton is given the details of Petoria while sitting in a chair in the buff.
* OverlyLongGag: Mayor West enjoying taffy.
* PrisonRape: Quagmire mentions that Peter might go to jail for taking his beer mug outside, and not the good jail you see on Cinemax, the "man" jail.
* ShoutOut
** [[Film/AsGoodAsItGets "You're why cavemen painted on walls"]].
** Lois' "first lady" outfit is based on that of Jackie Kennedy.
* YouAndWhatArmy: When Chris tells Peter that someone's blocking the fence, Peter asks "Him and what army?". Chris replies "The ''U.S.'' Army".
-->'''Peter:''' [[OhCrap Oh, that's a good army.]]
* VillainCred: Played for laughs. Peter's only allies after annexing Joe's pool are the world's pariahs. Later, he has a pool party with them.