21. After the fall of constantinople the trade in Europe it led to the decline of usage in the silk routes and started the age of discovery and the end of the middle ages.
22. The Olmecs were the first major civilization in Mexico, Mesoamerica.
23. Before the European influence slave trade was used in exchange for domesticated animals for labor. Like in Africa along the trans-saharan trade route some kings traded their people in order to receive horses as they were important and valuable.
24. The mughal empire fell due to the constant invasions. They ultimately fell as they were invaded by the Persians in India and ransacked Delhi. There were also invasions of Nadir Shah and Ahmad Shah Abdali resulting in further drainage of wealth.
25. The society moved on to the advent of money-based market economy and new forms of agricultural contracts. These agricultural contracts were basically the renting of lands in order to grow and produce crops to sell. In return they received a part of money made from those crops.