I think it’s subordinate since it can’t stand on its own. Subordinates add more information to the sentence.
The answer is materialism. This is evident as the narrator wishes to go to a remote cabin in the woods and essentially live off the land while depriving himself of human contact and engaging with nature. No mention of religion is made in the passage, nor is there any concepts of turmoil that the narrator makes note of. Instead, he talks of his willingness to move to Innisfree, to live in a cabin simply, as he views it as his purpose.
A claim is a topic that can be argued or debated
A thesis is statement that summarizes the main point of something.
