It was The EPLF that forced that article 39 to be added into the ethiopian constitution after the fall of the derg, you would see many ethiopians today especially amharic Blame Eritrea for article 39.
What's the difference between eplf and eritrea or the tplf for that matter?
The difference is in 1993 EPLF almost planned to remove TPLF because the habesh did what the habesh do best.. Change their minds about eritrea again, luckily we had 30,000 Troops in addis to make sure the referndum and seperation goes ahead, Meles started hinting about rescheduling the referndum and the next day Eplf were conducting Secret Meetings with The OLF (Oromo Liberation Front), Once meles heard about that he backtracked. Eplf and tplf hated each other from the inside and that 1 million Ethiiopian who died in tigray in 1984 was partially because the eplf shut the route from port sudan for the aid while the other route was through mengistu controlled area's. Article 39 was forced by the Eritreans so they would have the political escuse to seperate from ethiopia after the military victory, The onlf was promised to have their chance few years after but once eritrea seperated Meles Ignored it and messed ogaden up. If you look at the process for article 39 you can tell that a non ethiopian drafted that as it implies that any region who wish to seperate can hold a referndum in its region and votes are only acceptable by the local population, you see not the whole ethiopia but only indegionus population, That was done for eritrea and obviously 99.8% voted for seperation, i would imagine ogaden would easily get 50% if they had the chance but like i said Meles had other idea's. That is why eritreans are very sympathetic to ogaden because they were one of the four who helped shape it in the late 80's in sahel (ONLF,OLF,EPLF,TPLF) its like leaving a man behind. In the same token the tigrayan habesh like to live it there so they can threaten the amhara that without them ethiopia will break including Tigray so they use that against the amhara. What suprises eritreans most is that the ogadeni people actually saved More tigrayan lives than eritreans but their chage of hearts suprises Eritreans, How could you do that to people who helped you less than a generation ago??? One more thing Mengistu had more than 200,000 Troops at the peak of the war fighting and occupying Eritrea while had an ill equipped one divison controlling all of tigray.