Which advances helped increase China’s population? terrace farming
water wheels
curved-shaft plows
gunpowder

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;

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.