Everyone who has a job—from workers on an assembly line to the president of the united states—must pay income tax. this is an example of which of the following principles?

majority rule 
federalism 
rule of law
popular sovereignty 

Draw conclusions  why might a cause like italian unification successfully draw people of very different backgrounds together?  

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire

What event caused germany’s economy to fail?