The United States wanted to stop its nationalism.
        
             
        
        
        
Continental System, in the Napoleonic wars, the blockade designed by Napoleon to paralyze Great Britain through the destruction of British commerce. The decrees of Berlin (November 21, 1806) and Milan (December 17, 1807) proclaimed a blockade: neutrals and French allies were not to trade with the British.
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The answer is oxygen .
Other planets don't provide life and air