Thus they connected the heart of the South with the avenues to freedom in the North.[38] There were routes extending from this section into Ohio, Indiana, Illinois and Pennsylvania.
Over the Ohio and Kentucky route culminating chiefly in Cleveland, Sandusky and Detroit, however, more fugitives made their way to freedom than through any other avenue,[39] partly too because they found the limestone caves very helpful for hiding by day.

These operations extended even through Tennessee into northern Georgia and Alabama.

Dillingham, Josiah Henson and Harriet Tubman used these routes to deliver many a Negro from slavery.
The opportunity thus offered to help the oppressed brought forward a class of anti-slavery men, who went beyond the limit of merely expressing their horror of the evil.

They believed that something should be done "to deliver the poor that cry and to direct the wanderer in the right way."[40] Translating into action what had long been restricted to academic discussion, these philanthropic workers ushered in a new era in the uplift of the blacks, making abolition more of a reality.

The abolition element of the North then could no longer be considered an insignificant minority advocating a hopeless cause but a factor in drawing from the South a part of its slave population and at the same time offering asylum to the free Negroes whom the southerners considered undesirable.[4l] Prominent among those who aided this migration in various ways were Benjamin Lundy of Tennessee and James G.Birney, a former slaveholder of Huntsville, Alabama, who manumitted his slaves and apprenticed and educated some of them in Ohio.
This exodus of the Negroes to the free States promoted the migration of others of their race to Canada, a more congenial part beyond the borders of the United States.