How large was the delegation that met to revise the articles of confederation?

The delegation that met to revise the Articles of Confederation was composed of 55 members.

Explanation:

In May of 1786, Charles Pinckney, of South Carolina, proposed that Congress revise the Articles of Confederation. Some of the changes he recommended were granting Congress the power to regulate domestic and foreign trade and provide a funding structure to raise money from state treasuries. However, unanimous approval was required, and on that occasion they did not reach any consensus.

In September, five states met at the Annapolis Convention (1786) to discuss adjustments to improve trade. The director, Alexander Hamilton, invited the representatives of the States to a convention in Philadelphia to discuss improvements in the federal government, which was attended by 55 delegates. After debating, Congress presented its plan to revise the Articles of Confederation on February 21, 1787.

Under the terms of the amendment, the Articles would remain in force until 1790, until each of the 13 States had ratified the new Constitution. On September 28, 1787, Congress sent the Constitution to the States for ratification. On July 2, 1788, Congress formally announced the ratification of the Constitution, after the ratification of the ninth State, New Hampshire, on June 21, 1788. Finally, on April 1, 1789, the House of Representatives met for the first time.