This Was the Dumbest and Costliest Conflict the Americas Ever Experienced The Paraguayan War was the Dumbest and Costliest Conflict the Americas Ever Experienced Kris Osborn · April 30, 2020 Please leave this field emptyStay Updated with Warrior Maven Subscribe for daily military news and updates delivered straight to your inbox. We don’t spam! Read our privacy policy for more info. Check your inbox or spam folder to confirm your subscription.