Aahhhhh the good old days
There was very low immigration between 1924 and 1965, but our government, both Democrats and Republicans, turned it's back on the American middle class and passed 1965 Immigration Reform, bringing in cheap labor from all over the world. This government has no intention of closing the borders. The ethnicity of this country has shifted permanently, and the 'good old days' as you call it, are gone forever.