A couple points I rushed over in trying to keep the original video (45 minutes) from going even longer:

1. The historical materialist lens of analyzing historical change focuses on the dynamism of (ii) “forces of production” clashing against the relatively-static (iii) “relations of production”, but obviously (i) material conditions can also dramatically change (i.e. environmental disruptions).

2. With the example of war-time restructuring of labour, women and minorities also joined the military, once again raising their bargaining power. Indeed, participation of the Allies’ colonial armies was particularly significant during WWII, and raised the colonies’ bargaining power for postwar independence movements.