What is the difference between World of Warcraft and the World of Warcraft the burning crusade

Ok, in the original, World of Warcraft, they had 8 races, 2 continents, 9 classes, and you could reach level 60.

In World of Warcraft, the Burning Cruscade, they added 2 races, the outland where you can use new flight mounts, and adds the ability to reach level 70. There were still 9 classes. They also added Jewelcrafting, and Inscription. Getting wow BC I believe also added the ability to go to the Arena.

In World of Warcraft, Wrath of The Lich King, they added Northrend, where you can also use flight mounts. The max Level is now available, at level 80. The newest, and first heroric class, the Death Knight, was added, and you need a level 55 character to make one. You can access Wintergrasp, and form arena teams. Reaching level 80 allows you to send armor to lower levels (again I think) and easier to make money.

In World of Warcraft, Cataclysm, not released, the max Level will be level 85. Talents will be greatly changed, 2 new races will come, and armor will greatly change.