This is mainly a general 'best practice' question.
We have built a Canadian version of a website. The original version was 'generic', but predominantly US based.
For the most part, the content will be very similar between the websites, although graphics and headings may change, for country specific marketing purposes (brand names, logos etc). A couple of pages may be dropped from the Canadian version and some (very little) 'newsy' content may vary between them.
At the new home page, visitors will now be asked to choose which site they wish to visit, but will not be prevented from viewing the other site if they wish.
The new website is in a sub-domain and is farily 'static' content wise.
Any general hints, recommendations or any potential issues with the above approach e.g. robots.txt setup, would be appreciated.