Nazi Germany and the Soviet Union had a non aggression pact. When Germany's attempt to conquer England failed Hitler turned his attention to the Soviet Union. When Germany broke the treaty with the Soviet Union the Soviet Union asked to join the Allies in the fight against the Axis Powers.
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It would be more difficult to pass Democratic policy ideas through the House between 2008 and 2010, compared to after the 2010 election.
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King Ferdinand and Queen Isabella of Spain sponsored Christopher Columbus' trip. They hoped that he would successfully find a way to bring gold and spices back to Europe from India and China, which would increase the wealth and status of Spain. While he didn't find that, he "discovered" the Americas, which allowed Spain to claim land and conquer it.
The Europeans found America and they all wanted to claim as much land as possible to extend their territories. This was also the start of the colonization era when many european powers rushed to make as many colonies in America as possible.