Claims to the historical Macedonian territory have been a bone of contention between which of the following countries?

1. The historical region of Macedonia is located in the Balkan Peninsula in Southeast Europe. 2. Claims to this historical territory have been a source of contention, primarily involving North Macedonia (which was formerly the Republic of Macedonia), Bulgaria, and Greece. 3. Both Bulgaria and Greece have historical and cultural claims linked to parts of the broader geographical region of Macedonia. 4. Portugal, Spain, and Romania are not directly involved in this specific territorial contention.