What are three clues used to find the root causes of primary sources or historical events?

Pl hell mafter the civil war which president was called a "carpetbagger"? a.lincolnb.johnsonb. grant

Which of these events was a severe setback for the u.s. war effort in the pacific?

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?