How do these democratic ideas
influence the decisions and actions of
American politicans

impeachment is when a president is committing treason or doing shading acts while in presidendcy therfor he can be impeached   by congress

the united states broke it's neutrality was the constant german sinking of trading vessels resulting in the loss of lives, one example would be the lusitania.

the principle of popular sovereignty is most closely related to the concept of

democracy