How is the structure of the section "States Can't Block Federal
Laws" similar to the structure of the section “When A Federal Law
Preempts A State Law"?

explanation:

boi that sentence trash

representative government

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more 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.