Many people who immigrated to the United States during the Gilded Age moved to the coasts of the United States. It really depended on where you were from, so if you were of European origin, you most likely migrated to the eastern coast, but if you were of Chinese origin, you most likely migrated to the western coasts. It was just based on what was the closest shore by boat.
If possible I'd say all of them except the fourth one down (parts of ecosystems are independant) but if not I'd say the most valid one is the second one down (healthy ecosystems help animals)
modern technology such as social media allows for candidates to more easily connect to voters ... Having two major political parties represented. Coalitions.
