About how many miles long is the mississippi river

Which article of the us constitution addresses the issue of interpeting the laws of the united states

Why do all market economies have taxes to support armed forces police forces public schools and at least some form of public transportation?

Using the president's schedule, identify one example of the president using constitutional powers and fulfilling his duties. then, explain how and why that power is limited. give your answer in the form of at least three complete sentences.