How did african american the abolitionist movement gain strength?

Former Slaves like Fredrick Douglas spoke out against the system of slavery.  Harriet Tubman who was also a former slave helped runaway slaves escape to the North where they found a better life.  Many Blacks enlisted in the Union army to fight for the Union.  President Lincoln praised these men for helping win the war.

albany plan of union, 1754. the albany plan of union was a plan to place the british north american colonies under a more centralized government

i would think it's industries and hydroelectric power