Why is the mexico constitution of 1917 significant

They wrote a new constitution in 1917 after a 7 year revolution against the former government. the constitution made many changes and the first constitution that was given social rights, rights for healthcare, the right for a place to live and lastly the right to work in any occupation that you want. all these right were given to the people of mexico. 

hope this helps. 

If i’m not mistaken your answer should be the freemen’s bureau started them. i really hope i could ! good luck