Final answer:
The convention of 1836 did not make slavery illegal. The 13th Amendment to the United States Constitution, ratified in 1865, made slavery illegal, except as a punishment for crime.
Step-by-step explanation:
The statement is false. The convention of 1836 did not make slavery illegal. In fact, the convention did not even address the issue of slavery. The quote you provided is actually from the 13th Amendment to the United States Constitution, which was ratified in 1865, not 1836. The 13th Amendment did make slavery illegal, except as a punishment for crime.