According to the u. s. constitution, article iv, section 4, the national government guarantees to provide the states all of the following except?
a. a republican form of government
b. protection against invasion
c. enforcement of the state constitution
d. protection against domestic violence

According to the U.S. Constitution, Article IV, Section 4, the national government guarantees to provide the states a republican form of government, protection against invasion, and enforcement of the state constitution. It does not include the protection of domestic violence. The answer would be letter D.