List three problems that were found in poor neighborhoods during the progressive era

No running water or sewer systems, unsafe working conditions and the buildings were extremely unsafe

 some answer you can put are 
unsafe buildings
long working hours for families
no garbage collection
no running water or sewer systems

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.