Final answer:
The statement describes Suburbanization, a trend where communities developed outside city centers influenced by improvements in transportation such as affordable automobiles and highways.
Step-by-step explanation:
The development trend described in the statement is Suburbanization. The creation of 10,000 identical homes housing 40,000 people and necessitating vehicle ownership corresponds with the historical pattern where communities formed on the outskirts of cities. These areas, known as suburbs, allowed for more space than city living and typically arose when transportation improvements, like the advent of affordable automobiles and improved highways, made commuting feasible. This allowed middle-class families to live away from the urban center and still maintain employment in the city. Suburbs grew rapidly in the 1950s, signifying an affordable, family-friendly living environment that promoted the 'American Dream.'