What two events inspired many northerners to begin to actively challenge slavery?

What would be considered a secondary source about the assasination of abraham lincoln

Atreaty was signed in 1842 to end the border dispute between the u. s. and britain in maine. which best expresses the end result for britain? *pic* the british lost all the territory in maine the british territory was bigger than that of the u. s. the british territory was smaller than that of the u. s. the british territory was the same size as the u. s. territory

What religions were founded in india