If it's the same as Xbox you need to google using a US DNS on your Playsration and then change your location settings.
https://support.unblock-us.com/customer/portal/articles/1367856?_ga=1.213883485.811632547.1442283337 Buy a VPN from them, $50 and boom!
Not too sure on the ins and outs of it as I don't have a PS4 but all you'd really need is a smart DNS service or a VPN service. DNS route probably easier but VPN could be more beneficial for other reasons.