Match the vocabulary word with its meaning. 1. a world with two superpowers ratify 2. a world with many great powers detente 3. the systematic killing of a people group by another genocide 4. a person or group that tries to improve the lives of others multipolar 5. to give formal approval to an agreement humanitarian 6. an easing of tensions between two nations ideology 7. a system of social beliefs, ideas, and values bipolar