What is a permanent commititee that considers a specific topic called

Look at the map of cities in the united states at the turn of the twentish century what impact did railroads have on cities across the united states at the turn of the twentish century

Which product would have been most likely to have been traded in this area at this time?

Government powers not provided to the national government in the us constitution but are rather given to the states by the 10th amendment is called?