but here's some information from testimony posted by the Maryland government:
"The U.S. Constitution offers two ways to add amendments to our
nation’s governing document in Article V. The process that has
always been used for all 27 amendments added to the Constitution
since 1789 is for an amendment to pass with a two-thirds vote in
each chamber of Congress and then be ratified by three-fourths of
the states.
The other, untested way laid out in Article V is for two-thirds of
state legislatures (or 34) to force Congress to call a constitutional
convention, also known as an “Article V convention,” to add
amendments to the Constitution once they are ratified by three-
fourths of the states. Throughout the 230-year history of the U.S.
Constitution, an Article V convention has never been called by Congress."