Ackermans are actually a product of Eldian experiments. So they're technically Eldian with enhanced human capabilities. While, the orientals are from Asia. They were friends with 145th King Fritz and helped build inside the walls. They're non-Eldians. They were persecuted because the king couldn't erase their memories. Ackermans were persecuted because they were considered a threat because of their superhuman capabilities and they couldn't be controlled. Eldians are actually those from the race of Ymir Fritz. While Ymir was the first founding Titan. Eldians used her spinal fluid to create mindless titans. Those from her race are called Subjects of Ymir. The subjects of Ymir are all connected at a single point i.e. the founding titan through P A T H S.