He believed their goal was to bring light and truth into the world.
They thought that they had found a new route to Asia, but in reality they found a route to an unexplored land called America. They wanted to have a new trade route to Asia, so naturally, when Columbus told them he found a new territory, they were disappointed and extremely frustrated with him and his discoveries.
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Countries like Germany and Italy faced massive economic and social hardships after World War I. This was one of the biggest reasons why countries like this turned to fascism and totalitarian style governments.
Germany is a perfect example of the aforementioned statement. Germany was blamed for World War I because of the Treaty of Versailles. This resulted in Germany having to pay billions of dollars in reparations to countries like France and Great Britain. This resulted in hyperinflation and the crashing of the German economy. During this time, Germans were looking for a leader who would restore Germany to their former glory. Hitler filled this cue, by playing off the anger, poor economic conditions, and the desire for revenge of the German citizens.
The main reason why slavery spread was that people owned large pieces of lands and they needed cheap work force. What better for them than to have a work force that was strong and completely free.