As far as the PRC is concerned Taiwan has always been part of the PRC. That was the point. The Taiwan policy of the PRC hasn’t changed.
It also depends on your personal definition of a "nation" and whether you consider the Chinese Civil War to be over.
Fun History Fact:
Truman wasn't initially willing to involve the US in defending Taiwan from the PRC finishing the job in 1949, but no one bothered to tell them that, and then the Korean War kicked off and he instituted what would become known as the "Containment" policy.
It has never been part of the PRC.
As far as the PRC is concerned Taiwan has always been part of the PRC. That was the point. The Taiwan policy of the PRC hasn’t changed.
It also depends on your personal definition of a "nation" and whether you consider the Chinese Civil War to be over.
Fun History Fact:
Truman wasn't initially willing to involve the US in defending Taiwan from the PRC finishing the job in 1949, but no one bothered to tell them that, and then the Korean War kicked off and he instituted what would become known as the "Containment" policy.