There are basically two systems, there is Capitalism and Socialism and most countries tend to use a combination of the two, known as a mixed economy. 
        
             
        
        
        
a) An A independent industry
 
        
             
        
        
        
Answer : George Brinton McClellan was an American soldier, civil engineer, railroad executive, and politician.
Explanation:
 
        
             
        
        
        
Answer:
i only know it for the first one so here it is 
Explanation:
Politically, both Egypt and Mesopotamia had a government with one main ruler, but Egypt had a centralized government with a pharaoh, while Mesopotamia had a decentralized government with a king. Socially, both civilizations were patriarchal, but Egypt was more lenient towards women while Mesopotamia was stricter.