What is a pure monopoly

Which of these belongs to the united states after the spanish american war ?

Why did un coalition troops battle iraqi forces in 1991? iraq had invaded saudi arabia, along with its other border nations.iraq had invaded kuwait, which was a major source of the world's oil.the united nations wanted to remove saddam hussein from power.the united nations wanted to prevent the trade of illegal drugs.

Jane determines x = 4 and y = 1 is the solution to the following system of equations.