Los europeos llevaban a un enemigo oculto a los indios: nuevas enfermedades. Los pueblos nativos de América no tenían inmunidad contra las enfermedades que los exploradores y colonos europeos traían consigo. Enfermedades como la viruela, la influenza, el sarampión e incluso la varicela resultaron mortales para los indios americanos.
The avenues of exchange they provided been open only for limited time spans and then blocked for years or decades at a time because of War.
People at both ends of the trading route have to secure and keep that area peaceful or else trade will not occur.
<span>The question is asking us to say whether it is acceptable to change your personality if you want the relationship to last. I think that the intended answer is "false" because a relationship should be something that is compatible with how you are and you could end up being unhappy if you change your personality. However, it is acceptable to change some negative traits such as excessive jealousy. </span>
