Which term refers to the growing cultural and economic differences between the north and south in the years leading up to the civil war

How did spanish benifit from 1494 treatiy of tordesillas

In 3-6 sentences describe the strategy between generals' grant and lee's armies at wilderness and spotslvania . why are they significant? i will mark brainliest! answer only if u truly know the correct answer

What from the columbian exchange had perhaps the biggest impact on the world?