What best describes the primary theme in the sewing machine's historical impact?

The primary theme of "collective invention" in the context of the sewing machine's historical impact emphasizes how various individuals and communities contributed to its development and evolution over time. The sewing machine was not the product of a single inventor but rather the result of cumulative efforts from multiple inventors and innovators who refined and improved upon existing designs. This collaborative environment highlights how the combined knowledge and experience of different people facilitated advancements in the technology, making the sewing machine more efficient and accessible.

Additionally, this theme showcases the significance of collective creativity and problem-solving in technological progress, illustrating how the interplay of ideas across different cultures and eras enhanced the functionality and usability of the sewing machine. In this way, the sewing machine is not merely a singular invention but a symbol of collaboration and shared innovation that influenced industries and societies globally.