This was the major reason for sectional tensions over the building of the transcontinental railroad.

The correct answer is 'commercial interest and competition'

It is decided to build a Trans-Continental Railroad to link the East Coast and West Coast together but the major reason for sectional tensions over the building of the Transcontinental Railroad was the routing or route. The timing of the Kansas-Nebraska Act which was causing a lot of issues with the people of North and South.

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