What was the impact of depicting slaves as being happy and good singers?

Different genres, like movies and novels, depicted —and some continue to do so even to this day— slaves through stereotypical figures that created a sense of relief and false or complacent consciousness for those who were the dominant groups in society —white, privileged men. Through these depictions, the resistance, the struggles, the pain and suffering, and the injustices —even death itself— that slaves had to endure were sadistically undermined for the favor and comfort of those in power.  

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.