Final answer:
Analyzing history on a large scale provides a comprehensive understanding but may overlook local nuances.
Step-by-step explanation:
When analyzing history on a large temporal and spatial scale, such as the history of the American civil rights movement, one advantage is that it provides a comprehensive understanding of historical events. This broad perspective can help grasp the overarching progress and patterns over time and across different regions. However, a significant disadvantage is the potential to overlook local nuances and specific details that may be critical to understanding the full complexity of an area or event. Thus, while a large-scale view offers valuable insights into historical trends, it may miss the richness of local contexts and individual stories that contribute to the historical tapestry.