Why did the popular election of presidents mean that campaigns now had to be conducted on a national scale?

All voters should be valued equally in presidential elections, no matter where they live. Our current Electoral College system, grounded in state laws which allocate electoral votes on a winner-take-all basis, leads presidential candidates to concentrate their resources on voters in a handful of swing states, relegating the vast majority of the country to spectator status. Instead, we should elect the president by a national popular vote—and there's a state-based, constitutional way to do so: The National Popular Vote interstate compact.

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churchill warned that the soviet union had cut eastern europe off from the west with an "iron curtain."

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the completion of the erie canal spurred the first great westward movement of american settlers, gave access to the rich land and resources west of the appalachians and made new york the preeminent commercial city in the united states.