I realize that everyone these days doesn't understand nuance, and social democracy which was supported by socialist and left-leaning parties is now equated with socialism, when in fact it never was or is the ultimate goal of those parties. I get it. But that doesn't make it socialism. Socialism is state control of the means of production, and it's the goal of every socialist party out there. Strict Marxists fight for it. Marxist-Leninists fight for it. Trotskyists and Maoists fight for it. Contemptible revisionist splitters (sorry, channeling Leninism there for a second) following Bernstein and Kautsky merely agreed to fight for it through democratic means rather than open conflict and revolution, and that latter group comprises pretty much every moderate Left Eurosocialist group out there. It also includes Bernie Sanders and much of the US socialist Left (though not their fellow travelers, who are naive enough to think it's all about healthcare for everyone).

Now, by those standards, I have yet to see socialism work. Every time the state takes something over, it becomes hideously corrupt, grossly inefficient and ends up failing. Then it either gets bailed out by the state (the preferred French method for dealing with state-controlled industry) or sold off (as Maggie Thatcher did, along with most eastern European post-communist states).

So let's see: we know planned economies fail 100% of the time. State industries have a failure rate approaching that if not at it (I'm sure there's one exception out there that's made money for brief periods of time due to market inefficiencies, like state-run oil companies in 2007). So then how is Trump wrong when saying socialism fails?