Agree in the Lord

With the discourse surrounding race/ ethnicity seemingly growing more polarized by the day, it can be easy for Christians on all sides of the divide to give up and simply "agree to disagree." In Philippians 4:2-3 we find two women at the church in Philippi engaged in a heated conflict. The Apostle Paul has some pointed instructions for them. What can we learn from this passage about the pursuit of ethnic unity in the church?