Name one area in which americans were calling for reform at the turn of the twentieth century.

Worker's rights

Explanation:

At the turn of the twentieth century, Americans were calling for reform in a great variety of areas. This was the Progressive period, and many Americans were looking for ways in which politics and society could be improved. One example was the case of worker's rights. During these time period, workers often received very low wages. Moreover, child labor was common, and working conditions were often uncomfortable and unsafe.

the authority to tax.

definitely a for sure. ill see and update if i get the answer