Germany 1932
ancient rome and greece
Athenians had democracy challenged, but always as a result of war, not from the public voting themselves into the treasury. It was finally dissolved by the Romans, long after Athens lost its independence. It never collapsed from economic means. I hope you're not planning on quoting me something from "The Decline and Fall of the Athenian Republic" by Alexander Fraser Tyler since
that book doesn't exist.
Rome didn't fall apart until long after it had stopped being a Republic. It also expanded and became more prosperous after the Emperor. And the Republic did not become a dictatorship because of overspending, but through the ambitions of a general.
Even the Nazis in the Weimar Republic, who come closest to your premise, didn't capture a majority (only about 32%). And even then, I wouldn't call it people voting to gain access to the purse strings that bankrupted Germany. Germany had massive war debt and the Great Depression crippled the German banks. The public just opposed austerity in the face of economic disaster. The only way your point would hold any water is if you think the 1927 unemployment insurance caused Germany's economic crisis and I view that as ridiculous because of the world-wide depression.