Italia Irredenta (eng: unreclaimed Italy) is a decision available to 
Italy, which gives cores on a big part of modern-day Northern Italy and 
Croatia.
Listed if:
- Is Italy
- Has not taken this decision before
Available when:
- Is a great power or has invented National Fraternity (State & Government)
Effect:
- Gain cores on all provinces in states Venezia, South Tirol, Istria, and Dalmatia
There is no downside to taking the decision, other than the potential conflict with 
Austria over the provinces.