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Quoting page 63: Business interests not surprisingly supported the [1965 immigration reform] bill as well, but were not a driving force behind it. Because the baby boom was pouring new workers into the economy, and the assault on racial discrimination promised to feed millions of underemployed blacks into the workforce as well, employers did not seem to be looking for workers overseas. Even the growers were quiet. Sponsors of the Bracero farm worker program that had imported hundreds of thousands of mostly Mexican contract workers since 1942—the program averaged 430,000 guestworkers a year from Mexico during its peak 1955-60 years—the growers had been attacked by organized labor, religious, and civil rights organization for exploiting foreign workers and depressing labor standards. The same liberal coalition that backed the civil rights and immigration reforms of 1964-65 had persuaded Congress to terminate the Bracero program in 1964. …
The Wall Street Journal, commenting on the conservative nature of the immigration reform, noted on October 4, 1965, that the family preference priorities would ensure that “the new immigration system would not stray radically from the old one.” The historically restrictionist American Legion Magazine agreed, reassured by the promises of continuity. As Senator Edward Kennedy had pledged in the Senate hearings on immigration, first, “Under the proposed bill, the present level of immigration remains substantially the same,” and second, “the ethnic mix of this country will not be upset.
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Hugh Davis Graham (Collision Course: The Strange Convergence of Affirmative Action and Immigration Policy in America)