In the context of "The Call of the Wild," when it is stated that Buck improved the solidarity of the team as the new lead dog, it means that he strengthened the unity and cooperation among the sled dogs. Prior to Buck's leadership, the team may have been disorganized or lacked harmony, possibly leading to inefficiency or conflicts. However, with Buck as the new leader, he likely fostered a sense of teamwork and loyalty among the dogs, enabling them to work together more effectively and efficiently towards a common goal.
