One piece of the evidence is <span>they have a king.
The fact that the Houyhnhnm have king means that they develop a complex social structure and separate each roles to all creatures within their community.
This means that they already develop a civilization just like its used in human civilization.</span>
Because they were excecuting mass genocide of citizens with "undesirable traits"
Answer:
A It made them citizens of the United States
Germany had to pay for their war costs for world war 1