What part of the turkey is saved and snapped as a superstitious good luck custom?

The wishbone is saved and snapped as a superstitious good luck custom. The Ancient Romans were the first to view the wishbone as a symbol of good luck. That is basically how the tradition started. The wishbone should be left out to dry before snapping it, or it won't crack the correct way. How the 'luck' started was that Etruscans believed that birds were oracles (a message from God) and that they could tell the future. 

What area are in blue

The lutherans i believe. i hope this : )