When I click on many of the songs in my purchased song history I get the message "The item you've requested is not currently available in the U.S. store." HOWEVER, when I search iTunes they ARE in fact in the iTunes store.

Hello jwight,

It sounds like you are unable to download your purchased content, but you can find it without issue in the iTunes Store. I recommend signing out of your iTunes account with the following article:

iTunes 11 for Mac: Manage your iTunes Store account

http://support.apple.com/kb/PH12299

Then restart your computer, sign back in and try to download the purchase again.

If the issue persists, I would report an issue to the iTunes Support team with the following article:

How to report an issue with your iTunes Store, App Store, Mac App Store, or iBooks Store purchase

http://support.apple.com/kb/ht1933

Thank you for using Apple Support Communities.

All the best,

Sterling