Which statement about interstate compacts is true? they may involve several states. most are between the national government and foreign states. they may involve no more than two states. most are between states and private citizens.

The answer is "They may involve several states."

Interstate compacts refers to an intentional arrangement between two or more states that is intended to take care of their normal issues and that turns out to be a piece of the laws of each state.  

Interstate compacts in the United States were first utilized by the American provinces to settle limit debate. After the American Revolution, states kept on utilizing interstate compacts to meet their different needs. Despite the fact that these compacts were important for quiet communication between the states, they represented a risk to the eventual fate of the United States: if states were permitted to shape ground-breaking alliances, they may be enticed to split far from whatever is left of the nation and crack the Union.