Both Germany and the UK have well industrialized economic systems since the UK was the first to develop the Industrial Revolution with its use of factories and socialized labour and the use of coal and the development of steel making, textiles etc and Germany was not far behind.
State Representation is based off the population of the state, since slaves weren't technically citizens, they were not counted in deciding how many representatives a state had. Slaves were a large majority of the population in the south. The south thought they were under represented and wanted slaves to be counted so representation was fair in their eyes.
