* Vikings were not the first to reach the Americas. There is substantial evidence suggesting people from Asia reached the Americas thousands of years before the Vikings. The most widely accepted theory is that people crossed the Bering Land Bridge from Asia to North America during the last Ice Age, eventually spreading throughout the Americas.
* DNA evidence suggests multiple migrations: Genetic studies indicate that the ancestors of indigenous Americans likely migrated in waves from Asia, making the Bering Land Bridge theory the most plausible explanation for the initial peopling of the Americas.
* Early European exploration: While the Vikings are the most famous early European explorers of the Americas, there is evidence suggesting other Europeans, possibly from Ireland or Portugal, may have reached the Americas before them.
In short, the Vikings were not the only early people to reach the Americas. We know that there were migrations from Asia and likely other parts of the world, making the statement about certainty based on Viking voyages incorrect.
It's important to note that:
* The exact origins and timelines of early human migrations are still being debated. Archaeological and genetic research continue to shed light on the complex history of human movements across the globe.
* Vikings were significant explorers. Their voyages across the Atlantic were remarkable feats of seafaring, and their impact on European history is undeniable.
* It's crucial to avoid oversimplifying historical narratives. The story of how humans populated the Americas is intricate, involving multiple waves of migration from different origins.