This is a good post.
The 1st World War is complex, had Belgium not resisted and instead allowed the Germans to steamroll their way to Paris, it wouldn't have mattered very much what the Brits did, and certainly not the Yanks. At key moments in that war every one of the allies, particularly France, played a pivotal role, with the exception of the Americans. It was the threat of what the Americans might do had the war continued that played a far greater role than anything they actually did.
What the Germans did in occupied Belgium during the 1st World War was appalling, the mass killings, the slave labour, the deportations. Not enough people know the privations the Belgians suffered during that shameful period.