Federalism: Federalism is a system of government where power is divided between a central authority (federal government) and individual states.
Ratification: Ratification refers to the formal approval or acceptance of something, such as a treaty or constitution.
Shays' Rebellion: Shays' Rebellion was an armed uprising in Massachusetts in 1786-1787 by farmers who were protesting against high taxes and debt. This event highlighted the weaknesses of the Articles of Confederation and contributed to calls for reforming the national government.