Have you found it harder to rank .US domains?
Usually i would get .com .net or .org quite faster and with less effort, for about the same competition (low) but this .us domain of mine, is just stuck at page 5 or so....dancing a bit there, but no major improvement. It's been 2 months now, i know not too much but i've managed to get the general tlds within 2 weeks on page 1 for similiar level of comepetition.
Searching the web, i've found handful of other people complaining about the same, and of course bunch of blind google believers, stating that google doesnt make a difference, which would be my guess as well, if i haven't had this first hand experience.
Of course there are too many other factors, so i can't be 100% sure either. So if you've had similar experience and sound reasons to believe it's because of the TLD, please do share here
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It's amazing what you (L)earn when you put some effort into it!