How did Ellis island and angel island contribute to society in their respective time periods?

What is a treeless zone called? How did the eygptions use the nile? What missions are the closest to san buenaventura? What pipes were used for above ground drainage in empire state building? How many gate open in hirakud dam now? What to do if your period is on at a water park? What major river flows through the southeast? What is the three 'must sees' at the Epcot centre? What is the farthest distance from east to west in the United States? What region tha stretches between the Black Sea and Caspian Sea? What year did peter howson paint bridge to nowhere? What type of sharks live by the great barrier reef? Name the river which rises in russia flows through belarus and Ukraine? Does the Pacific Ocean have huge waves? Which landform would be hardest to hike through the Colorado Plateau or the Rocky Mountains? What oceans surround Trinidad? What is a Mexican statue called? Where does the river severn start and end? What Did China conquered? Who won the siege of Kenilworth Castle?

How did Ellis island and angel island contribute to society in their respective time periods?