Question

When was the us construction written

Answer 1

September 17, 1787.

This was the same place the Declaration of Independence was signed. The Constitution was written during the Philadelphia Convention—now known as the Constitutional Convention—which convened from May 25 to September 17, 1787. It was signed on September 17, 1787.

Answer 2

September 17, 1787 that was when they sing the US constitution