The people that came to this country in the early days were of the beaver type and they built up America because it was in their nature to build.

Then the rat-people began coming here, to house under the roof that others built.

And they try to undermine and ruin it because it is in their nature to destroy.

They call themselves anarchists.
A civilization rises when the beaver-men outnumber the rat-men.

When the rat-men get the upper hand the civilization falls.