Why was this congressional structure created by the framers of the constitution?

“a committee reviews the bill and marks it up to make it more viable and to reflect interests 

according to the map, most industrialization in europe occurred in the northwest.

the production of coal and lignite deposits was profitable throughout western europe.

the building of railroads transport goods throughout europe.

according to the map, the population trend indicates that more people are moving into cities.

northwest

coal and lignite depostis

railroads

cities

global and free trade