Romania's neutral in both wars, so they're not invaded.
In my Head-canon, Romania still involves the Great War like OTL but they completely lost to the Central powers.
After that there was year’s of bitterness and Want to take revenge against Austria and “People” thought they betrayed Romania. This will later bite the. In the ass sooner to came
This will helped an Actionist movement to grew Popularly that promises to fulfilled Greater Romania, known as “The Iron Guard” led by Corneliu Codreanu
(Soon nicknamed being “Featherstone of the Balkan/Europe” in Post-War era )
After soon the IG Party grew popular enough to get Elected into the Romania Government in 1932, now they can control Romania into their Extreme imagine and soon be Allie’s to the Entente Power especially Russia.
They joined Russian forces to attack on Central Power and Mainly goes full Blackbeard on AH in 1941 and occupied all of Transylvania and half of Hungry. They committed the worst crimes against Jews, Hungarian, Germans and Romani in SGW that it’s even rival to CSA, Japan and Russian crimes by its Brutality
But its all come to an end in 1944 when the Entente fall one by one, eventually Russia the Biggest Orthodox Allies to Legionnaires government surrendered.
Leaving Romania the only Entente power in the Eastern Europe Front, AH didn’t lose this opportunity and rush their army into Occupy lands to the way to Capital of Romania itself.
It’s was the Worst fighting in Europe besides the Battle of Warsaw but after 4 Years of Genocide, Brutality and Horror of Modern warfare faced by the AH and Romanian people, it’s finally over in a Danubian victory.
I assume the fate for any African-American the CS Army or FPG found would be immediate execution, unfortunately
If CSA treat their Blacks population is True, then it an referral way to die than Being tortured to death and Gassed in FG Campsite