What is Federalism and why is it unique to the United States compared to other countries?

 
What is Federalism and why is it unique to the United States compared to other countries?
Please respond to the following:

Based on the scenario and the knowledge gained from this section, address the following:

Discuss at least two effects on U.S. citizens that stem from the division of power between the federal and state governments.
Keep in mind that federalism is a requirement in the Constitution, so ending or weakening federalism requires a constitutional amendment.
What are some examples of where the federal government has ignored federalism and interfered in state matters?
What are some examples of where the states have ignored the Constitution and ignored federal matter?
Be careful not to mistake federalism for nationalism…just because it is called the “Federal” government does not mean it always acts federalist. Be sure and review the examples posted in the Instructor Insights section and ask questions if it is unclear (do not worry, this part gets confusing, so please ask questions or give the professor a call).