They were published in newspapers. The Federalist Papers were published in several newspapers across the country, which allowed them to reach a wide audience. This was important because the country was still largely rural at the time, and many people did not have access to books.
They made a strong case for the new Constitution. The Federalist Papers argued that the new Constitution would create a stronger and more efficient government that would be able to protect the rights of citizens. They also argued that the new Constitution would promote economic growth and prosperity.
They were endorsed by influential people. George Washington, who would become the first President of the United States, endorsed the Federalist Papers. This helped to give them credibility and legitimacy.
They helped to shape the public debate. The Federalist Papers helped to shape the public debate over the new Constitution. They provided arguments that could be used by both sides of the debate, and they helped to clarify the issues that were at stake.
In conclusion, the Federalist Papers gained widespread support because they were well-written, published in a widely accessible format, made a strong case for the new Constitution, were endorsed by influential people, and helped to shape the public debate.