When the nation's leaders met in 1787, these three problems needed to be addressed: tax collection irregularities in voting procedures law enforcement trade between the states slavery?

The correct answer is tax collection, law enforcement, and trade between states.

All of these problems were a result of the weaknesses in the Articles of Confederation. The Articles of Confederation was America's first constitution. Scared of having a strong central government, the Americans created a system in which state governments had almost all the power. All of the problems listed represent actions that the central (aka federal) government struggled with under the Articles of Confederation. In order to be a successful country, this needed to be changed.

the soviet union wanted to impose communist governments in eastern europe.

utilized the penal colony