How did many delegates from northern states at the constitutional convention view slavery

It was a mix of feelings.

Explanation:

Slaverywas one of the most difficult issues confronting the delegates. Slavery was widespread in the states at the time of the convention. At least a third of the convention's 55 delegates owned slaves, including all of the delegates from Virginia and South Carolina. Slaves comprised approximately one-fifth of the population of the states, and apart from northernmost New England, where slavery had largely been eliminated, slaves lived in all regions of the country.

they were all fought in the middle east during ww1