That is obnoxious. I've had to play with this a little bit when out of the country awhile back and I think to some extent it might be browser specific in terms of workarounds.
You can use a VPN - some free ones let you specify the country. Check if add-ons are available for your browser for this.
You could also try a free proxy service, get a US IP address and port and set that up in your browser. But those are often not too safe - don't allow https, some have used the PCs as a botnet, etc.
Also try searching on the phrase: stop country redirect
That should give you some different things to try with whatever browser. You can try adding your browser in the phrase to narrow things down.