My thoughts:

1. The history of the US is characterized by the annexation of land by white settlers, mass importation of revolutionary proles through slavery, global exploitation through imperialism, non-revolutionary settler trade unionism, and slow proletarianization of the white settler class through neoliberalism.
2. The contradictions of the current moment are the decline of imperial hegemony, worsening living conditions due to neoliberalism, and the inability of the capitalist system to address climate change.
3. The revolutionary class is not yet consolidated in the US.

There are a few candidates for the revolutionary class. The genocide against indigenous people was unfortunately so successful that they do not form a critical enough component of the economy to seize power (this is similar to the situation in Palestine, contrasted with South Africa). Black workers are an obvious candidate. However, nascent organizing of black workers in the 60s was crushed with extreme violence supported by the white settler class. Undocumented & temporary foreign workers are another possibility, but they are very marginalized through an intense & bipartisan focus on border security and are despised by the white settler class.

I believe a revolutionary class in the US will not be formed until imperial decline, neoliberal decay, and climate change force a full proletarianization of the white middle class and they accept solidarity with black workers & undocumented/temporary foreign workers.