Regional, or sectional, differences have existed in the american political arena since colonial times. these differences are evident in political party affiliations. historically, where did the strongest support for thomas jefferson's democratic-republican party lie

The correct answer is in the southern and mid-Atlantic states

It was succeeded by the Democratic party by those who followed Jackson later and you can still see how the support remained for the Democratic party in the mid-atlantic region even nowadays. The western you went the lower the support was, and the same went for Southern states which are nowadays republican but used to be heavily democratic.