Before revision:  We further aggregate opinions at the state and country levels, and find that the  percentage of the pro-vaccine group is lower in the Southeast part of the United States.
After revision:  We further aggregate opinions at the state and country levels, and find that the major changes in the percentages of different opinion groups roughly correspond to the major pandemic-related events. Interestingly, the percentage of the pro-vaccine group is lower in the Southeast part of the United States.