The salad bowl theory replaced the melting pot idea about the cultural and ethnic makeup of the United States. The melting pot idea was that America brought many different cultures and ethnicities together and "melted" or "blended" them all up into a uniquely America identity.
The Natives have to use the trees for making houses and making pens for livestock. it is very bad for the rainforest and could disappear in a 5 million years to turn into grassland.