Which of the following is an accurate description of the area of North America in the late nineteenth century known as the economic core?

Most other areas of North America depended on its factories for a wide array of manufactured goods.

In recent decades, due to strong protective tariffs against foreign imports, the area has continued to prosper as a leading manufacturing region.

This area struggled behind the other regions of North America economically and politically during the late nineteenth century and well into the twentieth century.

This area produced much of the food for other regions of North America and received manufactured goods from the southern colonies in return.