The knights and the samurai shared lot of similarities in their social status and their purpose in the societies. Both of the were protectors of the leader of the country. For their services of protection they were given free pieces of large parcels of land. They were the best warriors in their respective societies, and when there was a battle they were the elite unit that usually was the one that was winning the battle/war. Their only job in the society was to train for battle, and fight in battle.
I would go with Lavish Spending by the royal court.
Versailles had over 30 water fountains? Each were power by hand.
I know financing the American Revolution was expensive, and took several decades to pay back France.
America considers it paid particularly from WWI and WWII.
Because they got tired of oppressing south.
South was also tired of military rule. As the South got more and more upset about the military rule, North came under more pressure to end it.
The only reason for military rule was protecting the black rights. Most of the North didn't care abot black rights.
This was the reason why reconstruction ended.