Morgan could find no consistent, unambiguous cultural feature to indicate progress from one stage to another, but he continued to believe that ... Unilineal cultural evolutionism may have justified the global ambitions of Europe and made colonial rule appear inevitable and just.

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.

barack obama

i love this guy