Because hitler saw them as "unpure" races.
The seven senators who opposed the deal of the century—all of them Federalists—objected to Jefferson's exercise of executive authority in the absence of any specific constitutional authorization. Delaware senator Samuel White warned further that relocating settlers two or three thousand miles away from the capital might alienate their affections for the Union.
It can either bring people together into a new fused culture, or it can diffuse them. If various people exist of various cultures and a new empire rises then the leader has to accept all the people into his empire. This means that the cultures all exist and since they all have to behave according to what the emperor says, the cultures often mix and create somewhat of a mixed culture.If the empire separates people then it leads to diffusion because new aspects of cultures develop independently.
Thomas Jefferson was our third president
