Which two factors helped the Greek city-states develop strong economies? trade
the mountainous terrain
colonization
war

it is the dominance of   the spanish language and roman catholic region in mexico, french being the official language of several african countries, and the existence of a western-style government in south asian countries

d: their own individual powers within the new goverment

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

d. dr. francis collins