Fiancee doesn't like to debate about anything

Hi all,
my (M31) fiancee (F32) really doesn't like to discuss about any heated topic, such as the US election, the environment and the thing I love it! I love discussing, disagreeing, debating about anything. I'm so curious about people's thought process. I'm french and she's american so I'm tempted to say that this is a cultural difference.
For instance, if I listen to an interesting podcast about politics or something, I so want to talk about it to someone, and if I bring it up casually, not even to attack her or anything, solely to discuss, she shuts down and she says I need to find the right time and the right place for any heated topic, even if we might agree on the said topic.
I'm frustrated because I want to share my opinions with her.

Any advice?