Apparently, Apple's super-quick A5 chip, for the iPhone 4S and the iPad2, is no longer being manufactured overseas. It's still being built by Samsung; however, this chip is being designed in Samsung's new Austin, TX United States facility. The facility is said to be a massive 1.6 Million square foot complex; the size of nine football fields!
Interestingly, there are several other big names with semiconductor manufacturing in the Austin area: Freescale Semiconductor is based there and other chip companies, like ARM, Intel and Advanced Micro Devices, also have facilities. Semiconductor companies find Austin attractive due to a steady stream of educated employees from the engineering school at the University of Texas at Austin. Here's a quote from the Reuters article with some more details,
In fact, Austin has been unofficially nicknamed "Silicon Hills" because it is quickly becoming a secondary tech hub for the United States, next to Silicon Valley in California.
We are proud to share that this great city is where our offices are located too!
Source: BGR and Reuters