Northern and southern states compromised on the slave trade by
agreeing to continue the slave trade indefinitely
agreeing not to end the slave trade for at least 20 years
agreeing to end the slave trade immediately
agreeing to continue the slave trade for a maximum of 50 years

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.

the answer is a. harriet tubman was a nurse on the battlefield.