Which strategies or policies have governments used throughout history to unite their nations? Choose all answers that are correct.

Introducing feudalism

Unifying the legal code

Accepting religious toleration

Standardizing weights and measures

please give brainlilest

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.