One avenue to amend the Constitution includes all the following steps EXCEPT for which one? Amendment starts in Congress.
3/4 of the states must approve it.
2/3 of each House must approve it.
President signs it into law.

Amendment starts in Congress.

Explanation:

The process of amendment of the constitution may begin when;

The U.S. legislature form a two-thirds majority in both the Senate and the House of Representatives (congress) in favor of the proposed constitutional amendment;

Or

A national convention is called by Congress for for the purpose of constitutional amendment, when the legislatures of two-thirds of the states apply for the commencement of a constitutional amendment process.

The president signs the amendment into law at the end of the process. 3/4 of the states*about 38 out of 50 states) must approve the constitutional amendment.

We can see that constitutional amendment must not necessarily start in congress as explained above.

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

hope this