@Anon - Also, that's a pretty false statement to claim that "almost every single useful item" in the US was invented by a white person. There have always been nonwhite inventors, innovators, engineers and scientists in the US. All the way back to the 1600s and 1700s. Ex: Benjamin Banneker.
Over time after slavery ended and nonwhites were gradually allowed more and more equal opportunity in the US there have been an increasing number of nonwhite scientists, engineers, mathematicians, innovators, doctors, inventors, etc. If you go to most large hospitals in the US these days a good number of the doctors are African, Asian, Indian or Middle Eastern.
Fun Fact: Did you know the first refrigeration and freezer units in moving vans and trucks was invented by a black man? Before Frederick McKinley Jones made it possible to transport meat and dairy items across country by being able to keep them cold or frozen so they won't spoil there was little way to move such items across country. You had to go to local farmers or grocers to get those items. Now they can be made in California and be taken to be sold in New York.
Another fun fact: The computer is not a singular thing. It's a collection of several different machines and software working together. It doesn't have a single inventor. I'm pretty sure some parts of the computer have a black inventor or innovator along the way. I know one of the earliest commercial cell phones was made by a black person.
3rd fun fact: There are few things in this world that are purely an "African" or "European" or "Asian" invention. The majority of technological items in any continent are at least partially based on technology they encountered from other cultures. Europe is no exception. Ex: Guns, which Europe used to take over most of the world, originated mostly from Asia.
Off the top of my head carbon steel is something that was invented in Africa with virtually no outside influence. The Haya people of Tanzania invented a high-temperature blast furnace (burns at temperatures above 1,800 degrees Fahrenheit) about 2,000 years ago that allows them to create high-quality carbon steel. They did this long before contact with any Europeans and still do it today.
http://en.wikipedia.org/wiki/Haya_people
You can find plenty of African technology if you read articles on the history of Africa or the history of science and tech in Africa.
So will that hat be a Bowler, Pork Pie or 10-gallon? ;)