It was "mountain ranges in the north and west" that helped India develop for thousands of years in this way, since these mountains were very hard to cross with large armies.
New world animal domesticates include only two large birds ( The turkey in North America and muscovy duck, Caitina moschata, from mexico south into south America) A medium sized rodent ( Guinea pig, Cavia porcellus) The Dog in the western hemisphere
The military coup that started in April of 1974 marked the beginning of what was known as the Carnation Revolution.
