What I think 'imperialism' means comes up a lot in conversations about Syria and other wars. My position is that the word was botched from the beginning because it did not identify the mechanisms by which nations exploit nations.
Two books came out in 1902 about imperialism, one by an Indian nationalist writer Dadhabhai Naoroji, another by John A. Hobson. The books are, 'Poverty and Un-British Rule' & 'Imperialism: A Study'. Who did the western Left choose to get their opposition to imperialism from? Whose theoretical language did they adopt?