Why do most tornadoes occur in north America?

There are two main explanations. First, The United States, where most of North America's tornadoes occur, keeps track of virtually every tornado that touches down. The same cannot be said of other countries, many of which do not keep records of their tornadoes.

Second, the central United States has a perfect climate setup form producing tornadoes. Cold fronts (when col air plows into warm air) and/or dry lines (where dry air plows into moist air) move across the area and produce thunderstorms. The area also experiences strong wind shear, which makes the storms stronger and gives them the rotation they need to produce tornadoes.