Was this poster written by a federalist or anti-federalist?

It was written by a Federalist

Explanation:

The federalists were a group that advocated for the ratification of the new US Constitution, which established a strong central government, with enough enforcement powers to lead the newly born nation and consisting of three different branches: the judicial, executive and legislative, that could influence and limit the other under the system of Checks and Balances. The poster, then, was most likely written by a Federalist because it lists the main benefits of the new system of government created by the Constitution and encourages the reader to ratify it.

Bacon insisted that these experiments must be consistently repeated before truth could be known