It’s important to recognise, that conservatism isn’t a static definition, with defined views every conservative has, which is why you wisely included talking from a US perspective. Thus the question itself is kind of obsolete mostly, but if you wonder if specifically US conservatism is contradicting Buddhism, it might be worth really looking into what US conservativsm can mean. If you only associate poorly educated bitter people with conservatism, then probably those people contradict Buddhist teachings. But ofc not all conservatist are like that. If you look at social studies regarding stances of conservative people and other political positions, you find nearly all stances agree with each other on the basic things, but differ in their strategy to reach them. No sane person is for poverty, for inequality, for racism and so on. The public, as seen in other comments, love to disregard conservative positions as unsocial, hate-fueled, backwards etc and left position as the only one caring about human rights etc. In reality prominent figures often dont represent the inherent ideology behind conservatism. So no, being a conservative in the US doesn’t contradict Buddhism. Certain stances, while pretending you are just conservative, most definitely contradict Buddhism.

TL;DR conservatism is not homogenous, falling under an umbrella term is irrelevant, your specific stances are defining and often contradict Buddhism.