The US government is only the longest continuous democracy only if one believes that the US is still a democracy. I've read some decent arguments that the US stopped being a democracy with the McKinley administration, and others that the US ceased to be a functional democracy during the Second World War. In both cases, the claim was that the USA became an imperial oligarchy.

It is questionable whether any democracy truly exists at this point as I've seen no nation where the will of the people is typically manifested in the actions of the state.

Switzerland is a true democracy. I'm not sure if any others exist.

> I've seen no nation where the will of the people is typically manifested in the actions of the state.

To be fair, I've seen no nation where the people make their will known. Does a democracy depend on actual action or only theoretical possibility? It seems from my observance that most people consider democratic nations to be democratic not because they practice as such but because it is believed that the people have the opportunity to exercise democracy if they ever choose to.