What role did the vikings and the Chinese play in the Americas?

The Vikings, particularly Norse explorers like Leif Erikson, are believed to have reached North America around the year 1000, establishing a settlement at L'Anse aux Meadows in present-day Newfoundland, Canada, marking the earliest known European presence in the Americas. In contrast, there is no substantial evidence that the Chinese explored or settled in the Americas before Columbus's arrival in 1492; however, some theories suggest that Chinese expeditions may have reached the coasts of North America prior to this time, but these claims remain unproven and largely speculative. Overall, the Vikings represent a confirmed early European exploration, while the Chinese influence in the Americas during this period remains largely hypothetical.