Final answer:
Pro-Constitution forces called themselves 'Federalists' and were supporters of a strong central government and a federal system of power-sharing between the national government and states.
Step-by-step explanation:
During the period of intense debate surrounding the ratification of the United States Constitution, those in favor of the Constitution referred to themselves as Federalists. The Federalists supported a strong central government and believed in a federal system that shared powers between the national government and the states. They launched a vigorous campaign to sway public opinion towards their vision of a centralized republic, as opposed to the Anti-Federalists who favored stronger state governments and a weaker national government, fearing that a strong central government would threaten individual liberties. To address these concerns, the Federalists agreed to add a Bill of Rights to the Constitution, a crucial factor in securing its ratification.