Please help... fill in the blanks

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

Using complete sentences, explain how american indians felt about the land allotments. be sure to include their concerns about the program in your answer.

Appeasement proved a poor strategy for slowing german expansion because