The 2nd Dimension

&nbsp The 2nd Dimension is one of dozens dimensions in the multiverse

Canon
The 2nd Dimension's Tri-State Area is ruled by the 2nd Dimension's Heinz Doofenshmirtz, who enforces his dictatorship using Norm bots and the Platyborg. Due to his power, the Tri-State Area is modeled after him and its citizens wear doofralls, clothing that is compulsory to wear. There is a group of people called "The Resistance", the 2nd Dimension counterparts of Phineas and Ferb's friends, who fight against Doofenshmirtz's dictatorship

Ferbette
In Ferbette's contuinty the 2nd Dimension is both an altered vesrion of Danville and (due to the timespan between the two worlds) one of 2 possiable futures (the 1st being the canon future ,but the charcthers in this are not older in this one).The Tri-State Area was once a beautufil and peaceful place until Doofenshrmitz took over and captured all OWCA agents and turned them into cyborgs.,That's when a young Candace formed a resistance group with young Jermey,Isabella,Buford,Baljeet,and the Firestorm girls.Years later the 1st dimension counterparts of Phineas,Ferb,Perry,and Doofenshrmitz arrived and helped the Resistance defeated Doofesnrhmitz along with the Reistance's newest members at the time Phineas and Ferb

Then several weeks later (months in the 2nd Dimension) when Phineas,Ferb,and Candace wished Phineas and Ferb never did anything this summer their world literally collided with the 2nd Dimension erasing the timeline from Phineas and Ferb The Movie: Across the 2nd Dimension.Luckily the dimensions became separted agian ,but  Doofenshrmitz was unfortunally still in power and had almost everyone captured and turned into cyborgs.Years later he even exiled Phineas,Ferb,and Candace while on a mission with everyone thought they were dead.,But when they reunited with their 1st dimension counterparts they went back to the 2nd dimension and prepared for a final battle with Doofenshrmitz.During their 1st attempt however almost the whole Resistance were arrested and sent to Quantam Bay to be turned into cyborgs.,But luckily they were rescued by Candace,Jermey,Patrica,Florence,and the Fireside girls.Then the real battle began with the Resistance winning and Doofenshrmitz being transported to the Endless Blackhole Dimension.A year after the 2nd dimension was reverted to it's former glory and eveyone that was turned into a cyborg was turn back to normal as if nothing happened.The tri-state area became a republic, The Resistance was turned into the Council with Candace as their leader,and Phineas and Ferb were crowned the regent rulers of the Tri-State Area with Isabella as Ferb's future queen.