I believe the answer that you are looking for is interest.
Answer:
they lasted for more than 200 years
Answer:
federal system maintains close relationship between the government and the people because Federalism can eliminate the problems of the system, and in a federal system power is shared between the central government and state government. Similarly, people have the rights to choose the state and central government and they can vote for their candidates to run the governance.
Answer: the arrangement between two countries by which each has representatives in the other country