Final answer:
Reagan's statement referred to the Berlin Wall and the importance of tearing it down for the freedom of all people. He believed that as long as the wall stood, the question of freedom remained unanswered.
Step-by-step explanation:
Reagan's statement, "as long as the Brandenburg Gate is closed, as long as this scar of a wall is permitted to stand, it is not the German question alone that remains open, but the question of freedom for all mankind," was made during his speech at the Brandenburg Gate in 1987.
In this speech, Reagan was calling on General Secretary Gorbachev to tear down the Berlin Wall.
Reagan believed that the wall symbolized the lack of freedom and human rights not only for the German people, but for people around the world.
He saw the tearing down of the wall as a step towards freedom for all mankind.