In the united states, the states share power with the national government, but must follow federal laws. this is an example of which type of government? plz answer correct and federation parliamentary confederation unitary

Federation is the correct answer.

Explanation:

A federation can be defined as a political entity consisting of states, self-governing provinces and other regions under a strong central government. In a federation, the status of states and the division of power between the state and the center is mentioned in the constitution and cannot be altered by any party. The government found in a federation is all federalism. It is the opposite of unitary form. A unitary system is present in France, while the Federal system in the USA.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.