What was the federalist and who was the publius?

The Federalists were the people who strongly supported the newer Constitution of 1787. They wrote the Federalist Papers, which was 85 ages to because they really wanted the constitution ratified. The Publius was the name given to the pen that wronte the Federalists Papers.

what does the elastic cause give congress the power to do

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people vote for representatives who will make decisions on their behalf.