How Do I exactly Solve This I am quite confused on what my first step should be?

What features of the electoral system support the existence of a two party system and analyze one of these features and explain its role

Which answer best describes an advantage of shipping goods by canal? most towns would rather have canals than noisy railroads. goods could travel very fast downstream in the canal system. travelling by boat is a much more relaxing way to transport goods. heavy loads of goods could travel by boat more easily than if pulled by horses.

The supreme court case mcculloch versus maryland endured that