Missouri residents will have abortion on the ballot after the Missouri Supreme Court ruled Amendment 3 should be included in the November election.

Missourians for Constitutional Freedom, the coalition behind Amendment 3, has raised more than $16 million since launching in January. The largest donations have come from four out-of-state progressive nonprofits that are supporting abortion rights campaigns in several states.

Here's what to know about the amendment, what a 'yes' or 'no' vote could mean, and what proponents and opponents think of the measure.