What was the name of the union strategy to control the mississippi river and split the confederacy?

What new concept did the the american revolution introduce into the world

Which two sentences in this passage talk about china’s efforts to curb environmental degradation?

Which of the following is an example of a concurrent power? a. when a group of states work together to regulate interstate commerceb. when a federal law enforcement agency state policec. when a state creates a treaty with a foreign governmentd. when a local government collects taxes on imports