"I don't think the French expect me to respond to tweets," the country's president said.
"It doesn't matter if those who don't believe in multilateralism aren't there," a French official said.
The offensive sparked the collapse of the German army and arguably heralded the birth of modern warfare.
America is reasserting its role as a dominant, deterring force on the international stage.
Sergeant William Shemin and Private Henry Johnson were recognized "for conspicuous gallantry" nearly a century after serving.
War casualties used to be a bone of contention. Now it seems India has forgiven Britain its broken promises.
A hundred years after the Great War, Europe's past isn't past at all