A because they didn't want the revolution to spread to their country
During this era southerners were against letting slaves be free and many problems and disagreements came with this.
Thoureau wanted to poit to the fact that following traditions limits us and deprives us from developing our imgination. Thoreau, like other romantic authors, does not agree with tradition. He thinks it prevents people from finding true greatness and blocks their path to spirituality. "Castles in the air" are simply illusions by which people persuade themselves in something that is not true, in Thoureau's opinion.
I think it’s A I don’t know I’m also learning about this but I’m not sure