Well there's that, and you know, modes of transportation historically: walking, donkey, horse, wood raft (roughly 8,500 years old, also you must be wealthy.). So that sums up modes of transportation.

Historically, Jewish people were slaves in Egypt, in Ancient Rome and Greece people sold themselves into slavery. Race specific slavery was a much more recent thing. Since Jewish people were seemingly seen as inferior for a long chunk of time (see ancient Egypt up to WWII and it still is around, but much less) it would be fair to say that racism prevented them from being a part of society, so anything a Jewish person could have contributed to locomotion, that would have been limited by racism (they were slaves because they were seen as inferior).

Now that we've established a portion of people subjected to one of the worst forms of racism- slavery (note: Greek and Roman slavery wouldn't fit in as racism as it didn't identify a race as superior or inferior, nor did it assume a trait to a group of people. Slavery in that form is still bad, but does not fit the definition of racism.), we can check another more infamous segment of slavery, African slavery. African slavery began in 1619, this form of slavery is racist as it was done because they thought African people were inferior.

But there's a problem with racism preventing the spread of humanity- since slavery began 1619 and the industrial revolution was (1760-1840) through the industrial revolution, humanity got canals, steamboats, roads, railways. slavery ended 1865. This means that throughout a chunk of racism (being slavery due to "inferiority") we saw the largest increase in modes of transportation and therefore the spread of humanity.

I don't support racism and or slavery; but I don't see anything suggesting a correlation of racism and spread of humanity.