What does it mean to have a two party system

A two party system is a system in which only two parties are present and  relevant in the politics: in this system, the power is usually alternating between the two parties.

In contrast, in multi-party system, there are more parties, who form coalitions upon winning the elections, if they don't receive enough seats (in a two-party system coalitions are practically never found).

what does it mean:a political system consisting chiefly of two major parties, more or lessequal in strength.

Hamilton believed that the National Bank was permitted in terms of the 10th amendment. He interpreted it as if the National Bank was constitutional.