buhhhh. I can pull some stuff out of my ass, but it sounds like this question wants examples for a specific reading you did... Regional encounters between different cultures with negative effects might include: -forced migrations of the natives which caused people to settle new areas that not might be ecologically viable for their numbers. -Large armies moving into an area and burning or eating all of the available crops. -wars that involve mass enslavement, leading to large farming estates and depopulating their former areas. Allowing nature to "move back in" Global encounters between different cultures with negative effects might include: -Infectious disease -Massive New World fisheries depleting or competing with local sources. -Introduction of non-native species of plant or livestock that upsets the ecosystem. Regional encounters between different cultures with positive effects might include: -Trade allowed cultures to adopt new livestock and crops to diversify their diets and fields -Friendly cultures would be able to support one another through times of famine or plague. Global encounters between different cultures with positive effects might include: -Introduction of better methods for farming. I know that the Native Americans employed a migratory or 'slash and burn' method of farming which was not great for the soil and did not produce a lot of food each year. -Introduction of vaccines and other methods of preventing natural disasters like drought or floods. permalink