No, the USA has had no dictator until now. Is he serving the nation well? What did the twentieth-century dictators in Europe and the Second World do?
The dictatorial system had to be abolished in the Roman Republic in order for them to keep the republic—precisely because “dictator” and “tyrant” are synonymous—and it was finally subverted into the Empire when the dictatorship was revived.
Good grief. You don’t know what you are talking about. Educate yourself. Read the link. Stop embarrassing yourself.