Answer:
He's Biased against the government
Step-by-step explanation:
The author is biased against the government as he says in his essay that he is a believer of "The government is the best which governs not at all".
The author says that the government rarely does anything good and it derives its power from the majority, not because they have a legitimate viewpoint, but just for the reason that the most powerful group. He says that people shouldn't blindly follow any law that is passed by the majority and should do what is right in their opinions. People should distance themselves from a government which is unjust.
The specific act Thoreau speaks against in the first paragraph is Mexican-American war. He says that it was the work of a few individuals who used the government as a tool, because if it was up to people, they wouldn't have approved such thing
"Witness the present Mexican war, the work of comparatively a few individuals using the standing government as their tool; for, in the outset, the people would not have consented to this measure"