An invitation to compatriots to respond to President Roosevelt's invitation
(Call of Franklin Delano Roosevelt, 32nd President of the United States, to fight the Axis powers)

1942
The Nikola Tesla Museum in Belgrade keeps a letter that Tesla sent to the "brothers in America" in April 1942, during the Second World War.
Zoom in and read for yourself what it says ... the oldest Serb, Yugoslav, American ... in this call to fight against the forces of evil.