There have been a lot of objections to federalism because this is believed to cause more complications to the government due to the decentralization, which is a form of organization where the power of the central body is divided between its sub-unit. Many countries have adopted Federal systems, such as the USA, Canada, the European Union, and India.
In USA, federalism became one of the most important and innovative concept in their constitution. The federalism divides power between national government and the various state and territorial governments. Each of the state is governed by federal movement. In Canada, the power is divided between the federal or central government and the provincial government. There must be a division of the sovereign