"“A Negro labor force would tend to keep the Chinese steady, as the Chinese have kept the Irishmen quiet.”
Yep, divide and control. This is actually a really good example of the point I was making, so thanks for noting it. Moving ahead a bit historically, but on the same general theme, I'd call your attention to Stetson Kennedy's book "Southern Exposure," published in 1946, which offered a detailed and thoroughly documented expose of how major Northern industrialists were in full collusion with Southern racists to ensure a continued source of cheap manufacturing labor to fuel their operations. A book well worth seeking out for anyone interested in these issues/
Getting back to the railroads,I think you might want to look more deeply into the treatment of "coolie labor" by the railroads, because it isn't quite as simple as "paid labor.". It wasn't a particularly happy situation for those workers, to say the least, and their importation en masse by the railroads for the specific purpose of cheap labor was used as yet another tool for driving down wages overall in that particular sector. White rail workers saw the Chinese not as fellow laborers, but as a specific threat. This attitude continued long after the Transcontinental Railroad itself was completed, and led to incidents of racial violence between white and Chinese workers into the following decades, most notably the Rock Springs Massacre of 1885 in Wyoming, involving miners employed by the Union Pacific Railroad -- which in turn detonated a wave of anti-Chinese racism that swept rapidly across much of the Western United States.
Among those jumping on this particular bandwagon was the then-thriving Populist movement itself -- which adopted a rather militantly racist, anti-Chinese platform in response, which had the effect of pushing the entire movement sharply in the direction of reactionary nativism, and after a disastrous alliance with William Jennings Bryan's failed presidential campaign, to the movement's eventual adoption in the early years of the twentieth century of an overall white-supremacist orientation.
The remnants of that movement, especially in the Midwest, made a significant contribution to the rise of the Second Era Klan, a movement which swept the entire United States in the early twenties and even controlled the state of Indiana, before collapsing under the weight of a debilitating sex scandal in the late twenties. Its fragments in the 1930s drifted into other movements, notably those of Father Coughlin and Gerald L. K. Smith. After much fragmentation and straining thru the filters of Birchism and Cartoism, this identical strain of nativist populism -- its racism now encoded rather than worn on the sleeve -- resurfaced in the Buchanan movement in the 1990s, which eventually hijacked the straggling remains of Ross Perot's nativist but not especially racist Reform Party, and laid the groundwork for the populist movement that began in the late 2000s and continues to the present day.
History's fascinating, it really is -- and as Mr, Faulkner so aptly put it, "The past isn't dead. It isn't even past."