10: : A Sound Argument

: To maintain the Founding Titan's power, Historia must inherit the Beast Titan and produce as many children as possible during her remaining 13 years. The Emotional Rift

: Paradis must spend 50 years modernizing their military to compete with the world. 10 : A Sound Argument

The episode concludes with the realization that while the plan was logically "sound," it destroyed the very humanity the Survey Corps fought to protect. Attack on Titan - Season 4 Episode 10 - "A Sound Argument" : To maintain the Founding Titan's power, Historia

: In a poignant flashback, Eren Jaeger vehemently refuses to let Historia be used as a "breeding tool". 10 : A Sound Argument