The correct answers are:
- Ratifying treaties
- Establishing taxes on the middle class
The US Constitution says that the Senate has the power to approve or reject a resolution of ratification of treaties. If the resolution is approved, the ratification takes place. The US Constitution also gives the authority to Congress over financial and budgetary matters, this means that Congress has the power to lay and collect taxes, duties, imposts, and excises. The 16th Amendment extended the power of the Congress including the income taxes.