Answer:
see below
Step-by-step explanation:
Cities are formed around economies. Economies are built when a variety of products are available for sale in a free market, and begin growing. The key word there is variety. Different goods are sold because in order for an economy to thrive it needs to be diverse or the market doesn't have an economy. People come to new places seeking prosperity which is seen in the California gold rush. This potential prosperity casts a wide net across a variety of nations and brings them in. This is the main reason California is one of the most diverse states. There is more diversity in cities because they are centered around commerce which drives the economy and welcomes people of different demographics to come.