Answer:
The impact of Europeans in the Americas was overwhelming, the changed the economy, the demographics, and the culture of the continent. The continent would never be the same after their arrival.
Explanation:
Europeans changed the economy because they integrated the continent with the rest of the world (Europe, Asia, Africa, Oceania), which until then had been isolated. They also put themselves at the top of the economic structure, taking over from the indigenous elites.
They changed the demographics because, first of all, around 90% of the Native American population died after their arrival, mainly due to the spread of diseases. They also exterminated many others, and particularly in Latin America, mixed with the natives to create mestizo populations that are the majority in many countries like Mexico or Colombia.
Finally, they changed the culture because European culture became more dominant in language, religion, dress and so on. However, many Native American influences continued to be present in each of these cultural aspects, so that the contemporary culture of the Americas is neither fully European nor fully indigenous.
