The US nuclear industry has lagged behind because for the past 50 years, the regulatory and political environment allowed anti-nuclear activists to delay the completion of plants indefinitely.
Oh the hyperbole. 50 years ago (53 for you nitpickers) Shippingport came online. You know,
"the first fully civilian nuclear reactor." Nuclear power industry was just starting to appear, and the "regulatory and political environment" was anything but inimical to it. Rather gung-ho, in fact.
The past 30 years instead of 50? Probably. But not without good reason. An industry mired in secrecy and obfuscation stemming from its military origins, where screw-ups can happen and are serious -- potentially disastrous -- if they do, does not inspire confidence. Neither does pooh-poohing genuine concerns. "Waste? Oh, that's easy, we'll just reprocess it!" Sure. Hanford did that for years. Recovered tons of weapons fuel, ended up with additional megatons of extremely nasty waste. (Ditto Sellafield in the UK and La Hague in France.) There are better ways to do it for civilian use, and actinide burners may be one of them, which is why they should be built and studied; but they -- and all other things nuclear -- should not be presented as a silver bullet, in an arrogant and condescending tone.
Some may get an impression that I am too opposed to nuclear power. Not in the least. IMO, nuclear is the only sufficiently plentiful energy supply which we can comfortably use for the next thousand years, and is not geographically or otherwise limited like solar or wind. But it is not without risks, and while those risks should not be overstated (like the shrillest environmentalists do), they should not be swept under the carpet, either.