This agency was called The <span>United States Office of War Information</span>
<span>D. Europeans entered an age of naval exploration in an attempt to find alternate trade routes to Asian markets.</span>
This speech made Americans realize that we were a unified nation.
I don't know what "this" means here - but Spain, England and Portugal based their empires on their sea explorations and colonizations - all their colonies were not reachable (or only by de-tours) by land.
China, on the other hand was not based on Islands, but connected by land: so here China is the best option.
