Starlings are birds that were brought into the united states from europe for breeding purposes. their numbers have increased to such an extent that they have dislodged native birds, caused crop damage. they also carry swine diseases. what role do they play in the ecosystems of the united states?

The question is asking the determine the role that the United States do in the ecosystem base on the passage and situation in the question that you have state, base on my research, I would say that its role is a Dominant. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification 

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If you get a map and put the countries a states all together it forms all one piece you can also tell because of the earth quakes