A communist system of government is an economic system where the government plans and controls the economy with a single party governing and administering power that is authoritarian in nature. The state controls are imposed with an elimination of the privatisation of property or capital with a claim to make progress towards a higher social order where goods and services are equally shared among the people i.e, the classless society.
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Indus river (India): Harappa And the city of Mohenjo-daro
Nile river (Egypt): Ancient egyptian pryramid structures, obelisks, System of mathmatics, Medicine development, etc.
Huang he (China): The great wall of china build, development of budda religion, growing rice products.
Tigris-Euphrates (Mesopotamia): The wheel, plow tool, and cut canals and river connections.
The people of ancient India lived in a land of extremes. The terrain<span> was varied and often presented great challenges. Occasional extremes of weather such as </span>droughts<span> and monsoons were also part of life in this land. However, great civilizations developed and flourished amidst the rivers, mountains, plains and deserts of the </span>subcontinent<span>.</span>
If you've been assigned a research paper on the Holy Wars, then an "Encyclopedia" would provide a factual base for additional research, since it is the most reliable.