Why was the system chosen?

Why was the system chosen?
When the United States was founded in the late 18th Century, a national campaign was virtually impossible given the size of the country and the difficulty of communication.
Also, the US at the time had little in the way of national identity, states were jealous of their rights, political parties were suspect, and the popular vote somewhat feared.
The framers of the constitution in 1787 rejected both the election of the president by Congress and election by direct popular vote, on the grounds that people would vote for their local candidate and the big states would dominate.
The Southern states favoured the electoral college system because while slaves had no votes, under the constitution they were tallied as three-fifths of a person in the census.
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