How did the Brown v. Board of Education decision affect the Plessy v. Ferguson ruling?

In 100,000 years, the rotation of earth will be slower by how many seconds?

Think about the different ecosystems we would find while studying the physical geography of the united states. which ecosystem do you live in? in a short paragraph, describe the ecosystem that surrounds you. what kinds of plants and animals are common in your area?

According to your text, systems of government in the united states are shifting from what to what?