Translation of Wirksamkeit

Yesterday, I heard a very good example to explain my point: On their journey more than ten years ago, the presidential couple Mr. and Mrs. Clinton visited Egypt. They were welcomed by the president.
She insisted that there should be an actual step, where the man proposes friendship to the woman, at a nice dinner or giving her a gift or flowers or going down on his knees. Cultural differences.
The city was incredibly vivid and we were impressed by its size. We walked a lot through all the different neighborhoods, starting with Recoleta, an upper class neighborhood with its famous cemetery.