Turn me right and I was nearly frozen,   
 Turn me left and I'm open,  
 And I was once my own reflection,   
 Well... Before the revolution


Hint 1:
>! If you massively rearrange me, I can be American

Hint 2: 
>! The term "revolution" refers to a political revolution.

Answer:
>! I am the French Flag, vertical bands of blue/white/red. Chile's flag used to be horizontal blue/white/red bars. A common flag declaring a place "open" is red/white/blue horizontal bars. France's flag was, for a time, a reflection of its current self, prior to the French Revolution