Why did westward expansion lead to increased tension over slavery in the us?

As new Western states joined the union, it inflamed tensions over the free and slave states in Congress.

Explanation:

travels along an axon. this triggers a wave of electrical activity that passes from the cell body along the length of the axon to the synapse

john maynrd keynes developed new economic respose to the                           ( b. great depression if the 1930's)