At the end of the 19th century, the USA encouraged immigration with an Open Door policy, accepting immigrants from various countries to make the country richer
By 1919, more than 40 million people had arrived in the USA, resulting in a mixture of people from different races, cultures, and religions living in America and speaking different languages
Push and pull factors influenced people to immigrate to the USA, such as escaping poverty, political and economic persecution, promise of religious tolerance, plentiful land, creating a better life, spirit of adventure, and equal opportunity
Most immigrants travelled by sea, with more than 70% arriving on Ellis Island near New York, where as many as 5,000 people a day arrived during the busiest periods
Literacy Test, 1917: immigrants had to pass reading and writing tests, many failed and were refused entry
Emergency Quota Act, 1921: restricted the number of immigrants to 357,000 per year, set a quota of 3% of the total population of any overseas group already in the USA in 1910
National Origins Act, 1924: cut the quota of immigrants to 2% of its population in the USA in 1890, aimed at restricting southern and eastern European immigrants, prohibited immigration from Asia
In September 1920, a bomb exploded on Wall Street killing 38 people, and another bomb destroyed the front of the Attorney General, A Mitchell Palmer's house, leading to the Red Scare and fear of communism threatening the American way of life
Palmer claimed there were around 150,000 communists in the country, leading to the arrest of as many as 6,000 without a hearing and deportation of hundreds
Sacco and Vanzetti were arrested and accused of armed robbery on a shoe factory in May 1920, during which a significant amount of money was stolen and two people were killed
Celestino Madeiros later admitted to committing the crime, but Sacco and Vanzetti still lost their appeal and were executed by electrocution in August 1927