Who was the first Secretary of the Treasury of the United States and also a key figure in The Federalist essays?

The first Secretary of the Treasury of the United States was Alexander Hamilton, who served from 1789 to 1795. He played a crucial role in establishing the nation's financial system and implementing policies that helped to stabilize the burgeoning economy after the Revolutionary War. Hamilton's economic vision included establishing a national bank, assuming state debts, and implementing tariffs to protect American industries.

In addition to his work as a treasury official, Hamilton was also one of the key authors of The Federalist essays, a series of writings intended to promote the ratification of the U.S. Constitution. These essays, along with those written by James Madison and John Jay, provided a strong argument for a stronger central government and have become significant in the study of American political theory. Hamilton's intellectual contributions in both finance and political philosophy have greatly influenced the formation of the United States.