by DeDaan
Only for security, although your example is correct. There is a third condition:3. controls at least 1 non-battleground country
So in this example:
A: 3 battleground countries
B: 2 non-battleground countries
A didn't secure domination!
Note that if you imply both examples to Central America, you would have Control (since you don't need a non-battleground to achieve Control).