De Soto is the explorer that discovered the Mississippi River.
        
                    
             
        
        
        
Two nations that fought on the side of Russia and Serbia in WWII were France and Britain. 
<h3>Which nations fought on the side of Russia and Serbia?</h3>
The French were allied to Russia so when war broke out and saw Russia and Serbia fighting against Germany and Austria-Hungary, France joined the Russians and Serbians. 
Britain was allied with France and so joined the war on the side of the French.
Find out more on World War I at brainly.com/question/14345035.
 
        
             
        
        
        
The law put a military government in place.
        
                    
             
        
        
        
Answer:
2, 3, 4
Baghdad was known for good education and universities. It was once one of the largest cities in the world. And, it was the capital of the Abbasid Caliphate, which was a dynasty. Hope it helps!