What are two ways the u. s. constitution keeps the central government from being to powerful?

Apoll showed voters prefer that members of congress act as delegates. how might we expect the effect of this to differ between senators and representatives?

In italy, the distance between milan in the north and palermo, sicily, in the south is about 550 miles. in the united states, the distance betweenboston, massachusetts, and savannah, georgia, is about 900 miles. do you think the american revolutionaries of 1776 in the 13 colonies faced some of the same challenges as the patriots who struggled for italian unity in the 1860s?  

World war i brought increased immigration to the united states from which country? germany france italy mexico