You are right, a vassal could buy out his lord
Blacks responded to these conditions in different ways. Some blacks followed the ideas of Booker T. Washington, the popular black leader of the early nineteen hundreds.
They were among eastern bloc nations
Answer: securing a just and lasting peace in Europe
Made killing at a distance more effiecient
Also it made arming, cothing and feeding soldiers cheaper than training them. So now young boys were recruited, armed, hopelessly undertrained and thrown into trench to die, hopefuly killing some opposing soldiers before that. It made soldiers a resource to be expended.