What was Shays’ Rebellion? Why did it represent the beginning of the end for the Articles of Confederation?

Shay's Rebellion showed the weaknesses of the Articles of Confederation. When the central government couldn't put down the rebellion, the first stirrings of federalism began to gather strength. ... The government gave most powers to the states, and the central government consisted only of a legislature.

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i think its provide for the common defense

the space race was a battle to make advanced technology to get to the moon and to get a better understanding of space.