The United States had declared war on Germany shortly before , and the Allies hoped that his presence would sway public opinion to their cause .
At the request of Wellington House Raemaekers visited the USA in 1917 to draw attention to his work .
The USA   had declared war on Germany shortly before , and the Allies hoped that his presence would sway public opinion to their cause .
At the request of Wellington House Raemaekers visited the USA in 1917 to draw attention to his work .