How did the issue of protective tarrifs further divide the north and south?

Areporter covering congress will probably try hardest to get an interview with

Is the weather changing? consider the data of severe weather that includes tornadoes occurring throughout the u. s. over the last four years. compare the severe weather for the last three years. then compare the first three months of 2017 with that data. based on previous years, what might the prediction be for weather during 2017?

What is the main idea of this excerpt