https://constitutionus.com/constitution/amendments/how-many-amendments-does-the-constitution-have/
https://www.worldatlas.com/articles/how-many-amendments-have-been-added-to-the-constitution.html
>Since 1789, when the constitution became the law of the United States, the constitution has been successfully amended 27 times. Six amendments have been proposed but not ratified, bringing the total number of amendments to the constitution to33.
>There are two steps to amend the United States Constitution. First, the federal government must agree on the text of the proposed amendment. This is done via a vote in both the House of Representatives and the Senate, requiring a 2/3rds majority in both chambers to pass. Alternatively, the amendment may be created via a special national convention called forth by state legislatures and created by Congress. The first method has been used with all 27 successful amendments.