Final answer:
Nathan and Rukmani and their family laugh uproariously after the harvest because they are celebrating a successful harvest. This is a natural expression of joy, akin to the celebratory traditions in agricultural societies, such as the Hebrew festival of Sukkot, and the slaves' songs of joy and sorrow.
Step-by-step explanation:
Nathan and Rukmani and their family laugh uproariously after the harvest because a) They are celebrating a successful harvest. This reaction is a common expression of joy and relief felt by agricultural communities upon securing the fruits of their long-term labor. It symbolizes not only the success of the present harvest but also the assurance of sustenance for the forthcoming seasons.
Their laughter can be compared to the joyous expressions found in other cultures and historical contexts. For instance, in Hebrew traditions, the festival of Sukkot was celebrated after the harvest, and even in the more somber circumstances of slavery, as described in the second reference, people found reasons to express joy through song and music during moments of communal significance.
Expressions of joy such as laughter or music are deeply rooted human responses to success, relief, or collective gatherings—be they in agricultural societies or during significant events throughout history.