The phrase "One of the most sweeping blows" uses a strong emotional connotation to help the author to emphasize the tragedy of American Indians. The rest of the excerpt gives information about that sweeping blow.
Go with A, it is always right for me haha like those times no one would let me copy id go with the A or C method
Many people walk into Black Friday with high expectations. This doesn't always work out because shoppers often find it very over overwhelming being in very crowded areas. A lot of people also find it frustrating when u want to buy something but its already gone at the shelf or the store runs out of the particular product. In the end, its all about your expectations of the experience.
In the simplest sense, positive means good or the opposite of negative. If you have a positive attitude about homework, for example, you're more likely to get positive feedback on your report card.