They observed and shared ideas
<span>During the 1920s, it was a turning point for the African-American people because there was a chance for them to escape the south cities to north cities in order to avoid the racial discrimination. This Great Migration that happened, had greatly improved the lives of the African American peoplemostly because they were given social freedom and were free to have opportunities.</span>
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.
<span>The main impact of the completion of the Panama Canal was to increased world trade.</span>
I think the answer is D, I might be wrong though but hope I helped! Sorry if I didn't!