Why was thomas jefferson concerned about losing control of the port of new orleans

he wanted to make sure the United States could ship its goods from the port :)

Two words: Mississippi River.

He didn't want to lose access to the Mississippi River, because back then travel on land was much to slow, so they would use the rivers and canals to quickly travel. And that was before the Industrial Revolution and the invention of trains, so water travel was the fastest by far. And New Orleans was a major port.

the number of senators, and representatives, the state has in congress.

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.