America is losing is democracy as the money in politics is determining policy more than the constituents votingAnd yet American's current president was elected despite him being out-spent 2:1 by Hillary Clinton. In the UK Leave won despite being outgunned and outspent by Remain.
In fact here is a study that claims campaign spending during general elections has essentially no impact whatsoever.
https://www.gsb.stanford.edu/gsb-cmis/gsb-cmis-download-auth...
China was dirt poor because of its long, unbroken history of dictatorship. It's still poor today, although given the fraudulent nature of many Chinese statistics it's hard to know how poor. But the fact that the PRC appears to have learned a few lessons by copying the success of more democratic capitalist nations, is in no way a vindication of dictatorship: there are still so many lessons for China to learn.
Finally, the "cultural imperialism" line. I wonder if you actually are Chinese, to be using that line, because it's one the PRC pushes constantly. The idea that dictatorship and democracy are two equally valid ways to run a country can be easily disproven by just looking at how many people mourn the passing of dictatorships when they fall (not many), or their success rates in various metrics. Democracy is clearly a much better way to run things.