Germany invaded Poland unprompted, which started WWII.
I believe that finding the balance of drones would be putting a limit on how many drones a country can use at one time. I'm not sure on the other 2 questions.
The correct answer for the question that is being presented above is this one: "They enacted laws and policies to block the integration of public schools." The state legislatures in the South react to the Brown v. Board of Education ruling by enacting <span>laws and policies to block the integration of public schools.</span>
