The Brest-Litovsk peach agreement was signed by Soviet Russia and the Central Powers. It stated Russia's participation in World War II had ended and that the nation had no further intention of fighting.
        
                    
             
        
        
        
Election polling has evolved considerably since that inaugural issue. Perhaps most notably, there has been an explosion in the number of election polls in the United States. Traugott (2005) estimated a 900-percent increase in trial heat polls between 1984 and 2000. The number has continued to grow since then, due largely to the rise in interactive-voice-response (IVR) and Internet polls since the 2000 election.
        
             
        
        
        
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Europa es el cuarto continente más poblado después de Asia, África y América con una población de 735.000.000 o alrededor del 11% de la población mundial. En los siglos XVII y XVIII, las naciones europeas conquistaron y saquearon la mayor parte de África, América, y gran parte de Asia.
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Answered below
Explanation:
The Iraq war began in 2003 with the invasion of Iraq and the overthrowing of Saddam Hussein by the US and its coalition. 
The goal of the Iraq war was to remove a regime that harboured terrorists, commited humans rights crimes, developed and used weapons of mass destruction and violated the demands of the United Nations.
The challenges of the Iraq war include; sectarian and ethnic tensions and conflicts, breakdown of Iraq's territorial integrity, as well as economic challenges.
The goal of the Afghanistan war was to remove the Taliban from power, in order to destroy Al Qaeda's terrorists and camps following the September 11, 2001, attacks on the United States.
Breakdown of security, destruction of infrastructure and civil conflicts are a few challenges from this war.