Slavery in the americans a. was based on race b. was banned in 1810 c. involved more women than men d. led to fighting between european countries

Only A is the correct answer. D is very general as many there were many reasons for wars in EU and none that I know over slavery

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.