Which describes an effect of Spanish and Portuguese exploration to the New World on the populations of native civilizations in the 16th century?
O The agricultural techniques from the Portuguese had the result of increasing the South American population.
O The immigration of Europeans into the region balanced the emigration of natives out of the region.
O The migration of Europeans into Mexico and South America caused a population increase in those regions.
O The migration of Europeans caused a massive decline in native populations due to disease.