What was the role of european plantations in the growth of slavery ?

Assuming you're referring to the plantations that Europeans had in the Americas, the effect was overwhelming, since the high demand for crops grown on these plantations meant there was a high demand for slaves to work on the fields, which increased importation rates of the slaves themselves dramatically. 

“larger states wanted congressional representation based on population, while smaller states wanted equal representation. they met in the middle. larger states wanted congressional representation based on population, while smaller states wanted equal representation.” i hope this information you.