How does the Civil Rights Movement evolve without the Immigration laws of the Early 20th Century?

Something I was thinking about was the effects of the various immigration restrictions laws passed in the late 1910s - early 1920s, and the effect it had on the great migration of blacks to the North.

If these laws weren't passed and you saw much less migration of Blacks to the North, could this end up hurting the Civil Rights movement. Specifically since with less blacks in the North means there will be less Black voters voting in elections, which would make politicians less willing to take their concerns seriously.

Also having a higher black population in the South could make Southern Whites more fearful about granting Civil Rights to blacks and could end up making Civil Rights much more violent than OTL.

Would this end up being the case. Or is the effect of the immigration laws on the Great Migration overstated and would end up not having that much impact.
 
First of all, the first great wave of black migration to the North happened before the restrictive laws--it came as a result of the War itself severely curtailing European immigration. This by itself created a base for future migrations (since the new arrivals could write their relatives in the South urging them to come).

Second, it is really hard to see no immigration restriction in the 1920s--the war had raised a great fear of "hyphenated Americans" loyal to the Old Country more than to America, as well as fear of Bolshevism (and of the non-Preotestant relgions of eastern and southern European immigrants). The 1924 law for example passed the House 322-71.

Besides, even if the US could somehow get through the 1920's without immigration restriction, it would surely be enacted during the 1930's. (It's the Great Depression, "we don't even have enough jobs for our own people" etc.) Indeed, in OTL one of the first repsonses to the Depression was a demand in Congress to tighten immigration laws even further.
 
Something I was thinking about was the effects of the various immigration restrictions laws passed in the late 1910s - early 1920s, and the effect it had on the great migration of blacks to the North.

If these laws weren't passed and you saw much less migration of Blacks to the North, could this end up hurting the Civil Rights movement. Specifically since with less blacks in the North means there will be less Black voters voting in elections, which would make politicians less willing to take their concerns seriously.

Also having a higher black population in the South could make Southern Whites more fearful about granting Civil Rights to blacks and could end up making Civil Rights much more violent than OTL.

Would this end up being the case. Or is the effect of the immigration laws on the Great Migration overstated and would end up not having that much impact.

I'd actually disagree on the African-American front; considering most of migrants North came to fill out the (ultimately temporary and always low-skill) factory work it created greater racial tensions between the black population and White working class. In addition, the speed and size of the migration decreased the relative pressure of assimilation and encouraged greater "voluntary segregation" alongside the formal restrictions, which over time retarded the growth of common identity and increased the impact later iniatives that produced blowback (For example, forced integration of schools which nessecitated, due to the situation on the ground, forced bussing of white children out of their local districts). A smaller, proportionally better educated, wealthier, and better integrated AA population is likely to elicite more sympathy and involvement/support from the majority White population for their cause
 
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