In the US, copyright holders of any other member nation have the same copyrights as American copyright holders (“national treatment”). In other words, for example, an author of a work on a foreign website accessed in the U.S. has the same copyright privileges as an author of an American website.
This protection exists regardless of whether or not the country of national origin has its own copyright law.
This protection is automatic, requiring no further action from the copyright holder. So, just like in the US, no registration of the copyright is necessary and no use of a copyright symbol is necessary to activate the protection.