the ratification process started when the Congress turned the Constitution over to the state legislatures for consideration through specially elected state conventions of the people.
The articles of the Constitution explicitly outline:
B - a bicameral nation legislature.
Article I, Section 1 explains how Congress is split into the Senate and House of Representatives, a form of national bicameral legislature.
The 13th Amendment forever abolished slavery as an institution in all U.S. states and territories. In addition to banning slavery, the amendment outlawed the practice of involuntary servitude and peonage. ... However, it ended slavery and began the long-term goal of achieving equality for all Americans.