Which practice continued in the south long after it had largely vanished in the north?

The practice that continuously happen in the South even after the largely vanished in the North is Dueling. This is a way of having to engage combat between two people in which they have weapons and rules provided in means of honorable conditions.

the correct answer option is: weapons.

explanation:

tensions rose as the two opposing superpowers competed for 'weapons'.

referring to the cold war (1945-1991), the two superpowers, usa and ussr, experienced a phase of struggle and conflict with each other. these two superpowers considered each other as a threat to their survival and thus opted for policies to strengthen their positions.

the two superpowers never went to war with each other directly but competed for weapons to preserve their positions.