A unitary system of government, or unitary state, is a state governed by a single entity. A confederate government system is a relationship (sometimes loose) between a smaller number of political units. More of an agreement than anything. Finally a federal government is a system that divides power between a strong national government and smaller local government.
All three of these are completely different things.
The Iroquois League developed a council system to make decisions. Each tribal chief was allowed one vote in tribal discussions, ensuring each tribe
Answer:
The expansion westward led to the territorial expansion of the United State
Explanation: Westward expansion was responsible for the expansion of the nation.