Americans have a love-hate relationship with immigration. We love to talk about when our families moved here and we love the cheap labor provided by immigrants. But we are often suspicious of immigrants, especially during times of war, recession or political upheaval. The Emergency Quota Act – which took effect 100 years ago Wednesday – and the Immigration Act of 1924 – which became law 97 years ago this month – are examples of the winds of change in American immigration policy.