Romania and Hungary and Transylvania

Okay I'm putting this question out, since there is no real Sunday best comments this week:

What is the most important thing to happen between Hungary and Romania in regards to Transylvania in your mind?

It could be the cultures that lived in the area, the buildings, the peoples, the history, it could be the legends from the area. You tell me.

I'll lay out the ground rules:

1) no history lesson, just what you think is important.

2) no "Transylvania is... (add the country name)"

3) No Attacks on myself, I know the history of the area, as my family is from Bistritsa, (Bistritz in German) and I am asking this question as a debate for Sunday.

I will publish anything which follows teh ground rules. Take you time.