Board Thread:Manga/@comment-25228560-20170402150806/@comment-31655854-20170408154429

NephilimGear wrote: Also, the history why only Eldians can turn into Titans is also a mystery. There has to be a reason why the flesh of Titans only come to Eldians and that in itself can be a dark history that threatens Eldians. I am pretty open minded. I don't want this show that delved into some philosphies to just curl up in itself and become a dichotomy of Good Vs Evil even Dragon Ball Z didn't go that route so it will be a shame if this manga and anime series goes this route.

Ymir Fritz used her Titan Founder abilities to apparently bring prosperity to her people. After she died 13 years later her soul split into the 9 Titans who fought against Marley and established the nation of Eldia. Then the 1700 years of ethnic cleansing began and the Edlians believing that they were the superior race began to use other races to reproduce more Eldians. The establishment of Eldia brought about the monarchy which passed down the the founder Titan every 13 years to each generation. After doing a bit of research I have found out that the Titan War was actually fought between the other 8 Titan factions for supremacy in Eldia, not with Marley. Marleyans saw this as an opportunity to take advantage of the internal conflict and triggered a civil war, where they were miraculously able to capture 7 of the 8 Titans that were at war with each other. The 145th King abandoned his duties as the maintainer of Law and Order in an attempt to escape conflict and took some of the Eldian population behind the walls.

Side note: So where had the Attack Titan been all this time, it was the only Titan that the Marleyans didn't capture and the King didn't take it behind the walls with him. It's interesting to think about how it was able to stay in Marley undetected.

Only Eldians can turn into Titans because they are subjects of Ymir, they share her ancestral blood. If you don't have the blood of an Eldian in you, you can't turn into a Titan and you can't have your memories swiped.