[["33 amendments to the United States Constitution have been proposed by the United States Congress and sent to the states for ratification since the Constitution was put into operation on March 4, 1789. Twenty-seven, having been ratified by the requisite number of states, are part of the Constitution.", 164.0], ["The founders also specified a process by which the Constitution may be amended, and since its ratification, the Constitution has been amended 27 times.", 54.0]]
how many times does the u. s. constitution been amended
history