The early civilizations of the nile river valley, mesopotamia, and the yellow river valley were similar because they were

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.

you would times this by how many days there are in a year 365*400=$146000