The supreme Court can declare laws unconstitutional.
It varies from Kingdom to Kingdom, but it is usually a life term, and also heretical, meaning that it usual passed down from family member to family member.
Because once an indentured servants time is up, you have to let them live their own life, but if you have a slave, you literally own them and keep them until they die if you choose to do so.
Civilizations connected through trade first via trading tools with other nearby communities then it evolved into trading more goods such as foods crops and weapons. Then with boats this allowed technology and customs to travel for example Egyptian sculptures influencing Greek art work and the silk road. This helped humanity since a example of isolation was japan until the Miji Restoration. Humanity needs trade in order to communicate and get things they cannot make in their region of the world.
European religious practices were so restrictive that's what led to the Pilgrims departing for North America. Religious persecution and questioning church practices led various sects to break away from Catholic Church as well as the Church of England. (hope this helps)
