What was not a challenge faved by america during the start of ww1

Many plains nations depended upon which animal for their survival?

What form of government is powers of states?

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?