To get the U.S. flag:

Get the en-US language pack at http://extensions.joomla.org/extensions/languages/translations-for-joomla/5341. Install it.

On the back-end go to COMPONENTS -> JOOMLAFISH -> LANGUAGES.

Highlight the U.S. extension and change the "Short code" field for English (United States) from empty to "us".

As replacing the U.K. flag with the U.S. flag is the major reason many use the US English translation, it would be nice if this worked out of the box.

Some peolple will see still GB flag
you can easy change to US flag
I am using Joomfish. In language section of Joomfish for image filename just put us.gif
After that you have american flag and you in business

This Language pack solves problems with applications that use time and dates. Americans should not be happy just using Great Britain time and language settings. This Enables Google Calendar and the gcalendar component to display in 12 hour format. It solves the problem!
Nice Job!!

Thanks for get tis sorted. It is very helpful, as I am building a site for a translator who lives in the USA. Very small thing but this translations comes with a Union Flag rather than the Stars and Stripes.

NB. Google does not judge the location of a website based on the language used. Consider for one moment that the USA is a multi lingual country, and as many people speak Spanish as there are English speakers. Google uses three things to determine the location of a website. Primary is the suffix...e.g. co.uk second is the IP address of the server, and lastly the location of the registered owner of the domain. The language is irrelevant. Of course if some one is looking for color and not colour, that could in theory be a problem... but I think you will find that google's algorithm is a bit more sophisticated that that. It will look for color and colour. That's how it will ask you if you are sure you have spelt far more complex words correctly. Do a search for "The Colour of Money" and you'll see what I mean.

Anyway, thanks again for the Amercianisation very useful, when dealing with... Americans =8¬)

I've been waiting for a US version. Note: Search Engines will believe your website is located in GB, if you have a GB language installed (which you probably do). That's fine if you live in GB, but if you live in the US, it hurts search ranking, or rather search placement.

I've just installed this language pack and so far it looks good, except that the revision dates at the bottom of articles don't show up. What you see is "LAST_UPDATED2." The other dates seem to be good - one of the things our English cousins disagree with us on!

It would be great to have one for the backend, too!