User blog comment:B214/General discussion/@comment-24421137-20150419051715/@comment-1359322-20150419062214

It's to show the significance of a powerful Blazer to a country especially a small one like Vermillion.

"A strong Blazer was crucial for a small state like Vermillion, and just like Samurai Ryouma who led this modest land of the Far East to victory in the Second World War, a strong enough mage-knight empowered his country to negotiate with larger nations as an equal. If she could learn to handle that power, it would become a vital asset for protecting the people of her kingdom, so Stella didn't give up."

- Volume 1, Chapter 1

Basically rather than winning the war, the existence of Ryoma allowed Japan to have a chance to negotiate with those superpower nations.