How does our two party system work to protect our liberty?

It doesn't. The system is not something written anywhere into law, but it is a consequence of how the law is structured. At least, it isn't written into legislative law, there it a scientific law describing it.

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.

fearing kabuki could corrupt the nation’s morals, japanese government officials

explanation:

the national morals was so the japanese and the kabuki would stop fighting