Final answer:
The Constitutional Convention of 1787 led Congress to state that its sole purpose was to revise the Articles of Confederation, which resulted in the creation of the United States Constitution.
Step-by-step explanation:
The event that led Congress to state the following: "The purpose of this May convention was 'the sole and express purpose of revising the Articles of Confederation'" was the Constitutional Convention of 1787.
The Convention was called in response to the economic crisis of the 1780s, the shortcomings of the Articles of Confederation, and the outbreak of Shays' Rebellion. Although the stated purpose was to revise the Articles, the delegates ultimately decided to build a new, strong federal government.
The delegates worked through the summer of 1787 and released the United States Constitution on September 17, 1787.