Final answer:
Thorvald wanted to return to Vinland as the country was not fully explored and possessed promising resources and conducive living conditions. These early Viking explorations inspired future European endeavors across the Atlantic.
Step-by-step explanation:
The exploration of Leif Erikson and his subsequent discovery of lands to the west, such as Vinland, stirred a sense of adventure and potential for further exploration among his family and followers. Leif's brother Thorvald expressed a desire to return to Vinland because he felt that the country had not been sufficiently explored. Thorvald sought to further investigate the territory, which held promise due to its resources such as grapes, timber, and fish—all valuable for trade and sustenance. The motivations for returning can also be seen in the context of establishing trade with the indigenous peoples, as evidenced by the later encounters which involved exchange of goods.
It is evident that the voyages to Vinland were also driven by the allure of the land's natural resources, the mild winters described, and the relatively equal length of days and nights, providing ideal conditions for settling and thriving. Over time, despite conflict with indigenous groups and internal challenges, the narrative of these lands continued to influence European exploration, as is suggested by the tale's impact on figures like Christopher Columbus centuries later.