The US has no concept for Africa, because unlike China which uses infrastructure projects and investment as a way to offload its export surplus the US is an overwhelmingly domestic economy.
There will never be an American 'Belt and Road' because it just doesn't make much sense for a country that has so little international economic exposure, whenever the US forms alliances it is towards purely political ends. In that sense one could indeed characterise the relationship with China as more stable. No Chinese leader is suddenly going to go isolationist over the next two decades just because they feel like it.