It started with the Chinese Exclusion Act of 1882, but 10 years later it then came to the US opening Ellis Island in which immigrates had spent time before being able to actually enter the US.
Answer: The Underground Railroad work by giving slaves and place to stay. The slaves went from house to house with a light in a window. Most of the houses had secret areas or false floors and carts. The slave would either get in one of the false floor area or get in the cart.
Harriet Tubman was the leader of the underground railroad. She would tell the slaves a certain time to go to each house.
Answer: A Ireland
Explanation: Ireland experienced the great potato famine in the 1800's