Happy yoga day!
I would say yoga is definitely associated with Indian culture, but it's not bound by it!
These days yoga is also associated with western culture because it's spreading so fast through the western world. Even here in Bulgaria and in other Eastern European countries yoga is coming in all shapes and colors.
The fact that yoga is a way of life, like a protocol, is the reason it has been practiced for thousands of years.
Western culture embraces it so much these days because the connection to the inner world that yoga promotes is what has been making people sick and depressed.
Inner peace is outer peace.