The International Travel Adapter that I bought from NZ Diver was perfect for what i wanted.
It was very inexpensive. It allowed me to charge my NZ laptop in the USA. It was exactly what it was advertiseed to be. It allowed me to plug my NZ male fittings into the USA female outlets. It did not change the current. But that was okay because y laptop cable had its own ltile current transformer on it.
Thank you NZ diver for solvig my problem without having to invest in an expensive multi-country adapter.