How did taking over new territories (such as Hawaii, Panama, Puerto Rico, and the Philippines) help make the United States a world power? (How did adding new territories led to more trade opportunities for American business?)

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