Missouri is the most populous state where a ballot measure could roll back a current ban on abortions at all stages of pregnancy.

Missourians approved Amendment 3, which would place language in the state constitution legalizing abortion. Abortion rights proponents plan to file lawsuits to strike down the state’s near-total ban.

Missourians voted to reverse the state’s strict abortion ban in the Nov. 5 election. Here’s when Amendment 3 will take effect.