Renault, owned mostly by the French government, is the majority stockholder of Nissan. So buy Toyota, or Mazda is you want a "Japanese" designed car. Ford holds a large minority ownership of Mazda. IIRC Toyota and GM are linked as well.
I am all for not shopping blue but I've seen an email about the hundreds of thousands of good young Americans that are buried in France during WWII not so long ago. We saved their butts, they should have supported us. I am more interested in not shopping France than I am in not shopping "blue". I think I can manage to do both but please see how many American's died there and we will see the correlation.