What does Ira Berlin mean when he says that freedom and slavery were created at the same moment? How does creating an “out” group strengthen the identity and status of the “in” group?

According to us supporters, which was a benefit of purchasing alaska? the territory would be a buffer to invasions from europe. the territory would provide a place for many americans to live. it would increase trade by improving access to the northern pacific. it would increase the united states’ power by creating a bond with russia.