...is this sarcasm? Cotton gin led to the growth of slavery in the southern US. I'm not saying this is the only factor to consider relating to inventing cotton

...is this sarcasm? Cotton gin led to the growth of slavery in the southern US. I'm not saying this is the only factor to consider relating to inventing cotton gin, but you went there... (as in, if you weren't being sarcastic, you could have chosen a less charged example)