Question

Which of the following describes federalism?

a strong loyalty to a state or region, sometimes at the expense of a nation
the idea that the US Constitution periodically can be updated or changed
the idea that a state could refuse to follow a federal law it disagreed with
a system that divides power between national and state governments

Answer 1

a system that divides power between national and state governments

Step-by-step explanation:

Answer 2

Federalism is the separation of national and regional governments, such as the separation of the federal, central government and the state governments in the US.

So the correct answer is:
a system that divides power between national and state governments