Answer:
The second half of "History in the Making" contributes to the development of the theme that when people collaborate, great things can be accomplished by describing the enthusiastic reaction of the men on the beach when the plane landed and by mentioning that the Wrights were generous with their praise for those who showed up for the flight. These details show that the success of the flight was not just the result of the Wright brothers' efforts, but also the result of a collective effort involving the support and enthusiasm of others. This reinforces the theme that when people collaborate and support one another, great things can be accomplished.