Which two south american countries have long been a source of silver?

Historians are concerned with the accuracy of their writings and readings but are also aware of the inability of authors to know every angle of every story biases, perspectives, beliefs, and a variety of other differences history being told by one person at a time no one being totally accurate, as hard as we try really need on this, and you^^

What were some of the difficulties the new immigrants face once they came to america?

What was the result of the struggle between the nationlist party and the communist party in china