Avatar the Last Airbender: The Perfect Nation Combo

(Somehow I knew that my opponent would choose a Fire Nation/Earth Kingdom combo lol) Also, FN is Fire Nation, EK is Earth Kingdom, WT is Water Tribes, and AN is Air Nomads. I will first answer my opponents arguments and then move on to my own points. 1. Majority of Land Yes, it would seem easy for a FN/EK combo to easily conquer the world because they own most of the land, but having a massive kingdom in the case of the Earth Kingdom makes it harder to defend all of the territory. The troops the EK have are powerful, yes, but they are so spread out beyond Ba Sing Se that it is not an effective defense against small, concentrated attack forces. The Water Tribes are concentrated in 2 key areas, and this make their tribes easier to defend than an entire continent, in the case of the EK. 2. Combo of offense and defense Once again, I predicted that this would be one of my opponent's key points. The FN is known for their offensive bending, and are very powerful when it comes to technology to attack with. My opponent hints that the EK is the best for defense (I hope thats what he meant lol), but the WT are also good for defense. While the EK's walls are powerful, they also depend on the earth to provide the material for their bending. However, the WT can build bases wherever they please, because they can freeze water into walls. The Northern Water Tribe is a good example of this. Also, you mentioned that the FN destroyed the Northern and Southern Water Tribes because the Avatar was absent, but how did FN forces get there in the first place? In search of the Avatar, so we can discount this argument. Also, the Northern Water Tribe was attacked Admiral Zhou, and he would never have left his first base we see him at if Prince Zuko had not confronted him and Zhou had discovered the Avatar was still alive. 3. The only reason the AN were destroyed was because Fire Lord Sozin unleashed a surprise attack upon the AN, as we see in Book 3 Episode 2. If it were simply dependent on bending, it would be much harder for the FN to destroy the AN so quickly. Now on to my points. .. 1. Technology of destruction Both the FN and WT have weapons that could easily destroy any opposing army. The FN has Bomb Zeppliens that can unleash a hailstorm of bombs upon unsuspecting warriers (Day of Black Sun, Pt. 2). Also, the FN attacked the massive walls of Ba Sing Se with a mega drill, that would have gotten through if it weren't for the Avatar. Thsi would easily destroy any EK defenses. The WT have their own weapons of destruction as well. Soka's father created stink bombs to sink FN ships, but these sea mine could easily destroy EK ships as well. 2. Defensive Abilities The FN primarily focuses on offensive weaponry, but the WT specialize in healing and repair. Ice walls that make up the defense structures of the WT could easily be repaired by bending more ice on them. Also, the WT has healers, such as Katara, that can heal wounds. This ability would be critical in long term warfare, and is something that the EK does not have. 3. Bending Speciality The FN has Energy Bending, it which chi is turned into a lightning bolt of sorts to attack a foe. The WT have healing and blood bending, an ability that can only be used in a Full Moon, but can be used to control a foe. Sure, the EK have Metal Bending, but the FN's energy bending would easily conduct into the metal and electrify any opponets touching the metal. Also, EK soldiers would lose their bending abilities in a Full Moon if the WT decides to bend their blood and make them fight each other. And, if by some slim chance, that a FN or WT warrier is wounded, a water bender can easily heal the wounded soldier, reading the soldier for more combat and more stress on the enemy. In conclusion, the EK/FN combo as suggested by my opponent is only effective if he is expecting prolonged seiges, but my FN/WT combo disallows for any prolongness, instead fighting in short, effective raids. The healing abilities of the WT allows more soldiers to fight, and more enemy troops to be killed. The FN can blow up, dig through, and destroy any EK/FN defense, and lead my FN/WT combo to victory. The WT's isolation works to their advantage, because their tribes are surrounded by their primary bending element on all sides. While the EK has a lot of earth, there are even lakes and oceans surrounding the EK, making their spread out troops have a much harder time defending all that land.