Final answer:
Article IV of the Constitution primarily deals with issues between states and between the states and the federal government, guaranteeing each state to have a "republican form of government" and protecting states from foreign invasions or internal conflicts.
Step-by-step explanation:
Article IV of the Constitution includes four sections that primarily deal with issues between states and between the states and the federal government. Article IV Section 4 contains the "Guarantee Clause," which guarantees each state to have a "republican form of government" and protects states from foreign invasions or internal conflicts. Additionally, Article IV Section 1 includes the "Full Faith and Credit" Clause, requiring states to respect legal court decisions of other states.