What is the first step in adding an amendment to the u. s. constitution? the amendment is sent to the state legislatures by the president. the amendment is voted upon by the voters of the united states. the amendment is proposed by a two-thirds vote of both houses of congress. the amendment is passed by three-fourths of the state legislatures.

The first step in adding an amendment to the U.S. Constitution is when it is passed by a two-thirds vote of both houses of Congress.

Explanation:

When an amendment to the Constitution is proposed, it is accepted and adopted into Constitutional law only with a vote by both the House of Representatives and the Senate.  There needs to be a two-thirds majority approval of the measure or the amendment will not pass. There have been 27 amendments to the Constitution in its history. The first 10 amendments are known as the Bill of Rights.  The last amendment was passed in 1992 but it was first proposed in 1789. The 27th Amendment makes it so congressional salaries cannot be changed until the next set of representatives are elected.  

c) legal battles last five weeks after the election due to the narrow victory in several states.