Which country and who invented the steam engine?

Newkman was the earliest inventor of the steam engine, but Watt only improved and innovated on the original basis. Newkman was the first steam engine that was really imagined, designed and manufactured. This is undeniable. It can only be said that Watt improved the primitive steam engine, not that he invented it. Please comment and reply to the email: hy050808 @126.com.