Because hitler saw them as "unpure" races.
<span>Now imagine that happening to an entire continent. This was the effect of Europeanimperialism in Africa in the late 19th century through the mid-20th century. ...Imperialism changed all this, as Europeans disrupted these traditional ways and imposed their beliefs and social structures on colonized Africans.</span>
Sage is the answer I’m sure
Charlemagne was crowned emperor of the west in 800 CE.
In general, the Monroe Doctrine represent a change in President Washington's foreign policy, since the Monroe Doctrine dictated that the US would treat any further attempts by Europeans to colonize the Americas as acts of aggression, and Washington was far more isolationist.