Who is credited with putting the concept of using mass-produced interchangeable parts into practice?

dewitt clinton
eli whitney
cyrus mccormick
peter cooper

This chart shows american troop strength during what conflict? a) gulf war b) korean war c) vietnam war d) world war ii

Which best describes the impact of the crusades on european exploration?

Which of these is one of the seven delinquent behaviors? a) voluntary manslaughter b) speeding in a school zone c) vandalism of public property d) destruction of private property