Which part of the constitution was important federalist idea

In the clash in 1788 over ratification of the Constitution by nine or more state conventions, Federalist supporters battled for a strong union and the adoption of the Constitution, and Anti-Federalists fought against the creation of a stronger national government and sought to leave the Articles of Confederation, the predecessor of the Constitution, intact. The Federalists included big property owners in the North, conservative small farmers and businessmen, wealthy merchants, clergymen, judges, lawyers, and professionals. They favored weaker state governments, a strong centralized government, the indirect election of government officials, longer term limits for officeholders, and representative, rather than direct, democracy.

Explanation:

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

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