1) The concept of federalism involves the division of powers between a central government and regional or local governments, allowing for shared governance and autonomy for different levels of administration.

2) Banks provide various financial products, including savings accounts, checking accounts, credit cards, mortgages, and investment services.

3) International relations encompass the study of relationships between nations, including diplomacy, treaties, and foreign policy. It examines the interactions and dynamics among different countries in the global arena.

4) The most-watched TV series finale in the United States was "MAS*H," with an estimated 105 million viewers.