It's hard to deny the racial aspect of government subsidies to produce the suburbs, but the government's official intent was not racial, but emergent and was strongly influenced by the threat of nuclear war. Shawn Otto of sciencedebate.org covers this in his book on politics and science, "Fool Me Twice" (apologies for the typos from my book-scanner):

...it has long been the prevailing opinion that American suburbs developed as a result of the increased use of the car, GI Bill funded home construction, and white flight from desegregated schools after the 1954 Supreme Court decision in Brown v. Board of Education of Topeka. But in reality the trend had started several years before Brown.

In 1945, the Bulletin of the Atomic Scientists began advocating for "dispersal," or "defense through decentralization" as the only realistic defense against nuclear weapons, and the federal government realized this was an important strategic move. Most city planners agreed, and America adopted a completely new way of life, one that was different from anything that had come before, by directing all new construction "away from congested central areas to their outer fringes and suburbs in low-density continuous development," and "the prevention of the metropolitan core's further spread by directing new construction into small, widely spaced satellite towns."

Nuclear safety measures drove the beginning of the abandonment of our cities. After being told that "there is no doubt about it: if you live within a few miles of where one of these bombs strike, you'll die" and "We can always hope that man will never use such a weapon but we should also adopt the Boy Scout slogan: Be prepared," getting far enough out of the "target" city so that the blast might be survivable seemed wise. Those who could afford to left. Those who remained were generally less affluent, and minorities made up a disproportionate share of the poor.

A far worse development for minorities in America came in 1954, when the federal Atomic Energy Commission realized that with the advent of the vastly more powerful hydrogen bomb, "the present national dispersion policy is inadequate in view of existing thermonuclear weapons effects." But by then it was too late; the suburbs were growing, but offices were still by and large downtown. A new strategy was needed. President Dwight D. Eisenhower instead promoted a program of rapid evacuation to rural regions. As a civil defense official who served from 1953 to 1957 explained, the focus changed "from 'Duck and Cover' to 'Run Like Hell.'"

Cities across America ran nuclear attack drills, each involving tens of thousands of residents, practicing clearing hundreds of city blocks in the shortest possible time.^° It became clear that this would require massive new transportation arteries in and out of cities. The resulting National Interstate and Defense Highways Act of 1956 was the largest public works project in history. It created a system that provided easier access from the suburbs into cities as well as a way to more rapidly evacuate cities in case of nuclear war. The new freeways had to be built in a hurry and were naturally routed through the cheapest real estate, which usually meant plowing through richly tapestried and vibrant minority communities, displacing millions. Although poverty had been concentrated in these very neighborhoods, their destruction ripped apart the social fabric of America's uprooted minority communities for years, destroying social support networks and leading to a generation of urban refugee.

These accommodations for defense brought about an immense change in the fabric of America, altering everything from transportation to land development to race relations to modern energy use and the extraordinary public sums that are spent on building and maintaining roads— creating challenges and burdens that are with us today, all because of science and the bomb.

Otto's Book:

https://books.google.com/books/about/Fool_Me_Twice.html?id=6...

More quotes from the book:

http://mxplx.com/Reference/id=1284