If by conservative you mean something akin to capitalistic, and unabashedly out to make money, from the housewife to the CEO, then yes.
If you mean something else, then it really isn't that cut and dry.
Everyone (a very large majority) is from somewhere else, and most came to Houston not because it was some kind of Shangri-La, but because of the opportunities.
Plus, for what it's worth, Houston is one of, if not the, most ethnically diverse city in the US. (Google it so I don't have to provide biased sources.)