By ethnic, I mean non-American.
I drove to my local Indian store to buy my Indian spices. When I bought my fish sauce, I prefer it is from Vietnam. Yesterday, I was buying soba noodle, and I was flipping over each of the bags to see if it is made in Japan. This is far from a hard rule, and I am especially relax when I know the background of the product. For example, I was buying my soy sauce from Yuet Hueng Yuen despite that it was made in Canada at the time. Still, there is definitely a bias -- as small as it may be.
What about you? Any preference?