Where are tornadoes most likely to occur?

What states are included in the high frequency area called Tornado Alley?  Why are these states most likely to experience a tornado?

Source: tornadochaser.net

How likely is the occurance of a tornado in New Jersey?  What explains the low probability?  Why do tornadoes occur infrequently west of the Rockies? Explain any patterns that you observe.

 

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