The problems faced are :

i. Weak in the conduct of foreign relations : Experience of the USA Shows that the states joining the federation may pass legislation that may embarrasses the national goverment in enforcing its healthy obligation in respect of aliens residing in USA.

ii. Linguistic, religious and racial differences between diferent regions promote mutual conflicts and separate tendencies.

iii. Preventing the creation of a national policy: The United States does not have a single policy on issues; instead, it has fifty-one policies, which often leads to confusion.
Leads to a lack of accountability: The overlap of the boundaries among national and state governments makes it tricky to assign blame for failed policies.

iv. Most Americans know little about their state and local governments, and turnout in state and local elections is often less than 25 percent. Citizens consequently often ignore state and local governments, even though these governments have a lot of power to affect people’s lives.

v. There is a great danger of conflicts in a federal Government because every State has a separate jurisdiction of rights. The conflicts between the Central and State Governments, results in non-co-operation between them.

vi. Generally in a federal government, there is double citizenship. In such a situation every citizen is the citizen of his own state as well as of the centre. Therefore, the citizens have to be loyal to their state and to the centre. Double loyalty is not good. In America, because of the principle of double citizenship, a citizen has to face many hardships when he goes to another state.