The Flexible response was a policy implemented by President John F. Kennedy in 1961 in order to substitute the New Look and the massive retaliation policy that Dwight Eisenhower's had introduced, which consisted on responding using a greater force in case of an attack, and such force involved nuclear weapons.
On the other hand, the flexible response policy aknowledges the Mutual assured destruction if nuclear weapons are involved, as the enemy with shoot back too. It aimed to provide a manner of responding to agression across the spectrum of war but without the employment of nuclear weapons.
Bearing in mind this passage, a) one way in which the Northwest Ordinance extended republican institutions into new territories was through the land rent to a settler and the proceeds were used to pay for schools. The ordinance encouraged this commitment involved with religion and morality. b) Another way that is not mentioned is that settled a precedent for federal support education, being the first national education law passed anywhere in the world. c) The Northwest Ordinance was the first and main conflict between them, because Native Americans were displaced across the Appalachians and the Midwest (today) and then, with the Ordinance they were promised decent treatment and education. However, many of them resisted and they stayed in their territories until the twentieth century.