Answer:
I would just say calm down and let's go get some treats so he can calm down
"And let every other power know that this Hemisphere intends to remain the master of its own house". This passage from Kennedy's inaugural address is a metaphor.
can You explain the question?
The purpose of alliteration in this sentence is to make the 'slogan' stick in people's minds. This person is trying to make coin collecting sound like a fun activity that people will want to do, and using alliteration like this will have them easily remember the slogan long after they've read it.