A source is one produced some time after the historical subject took place secondary or primary .

Why did joining the american cause have the potential to alienate lafayette and disgrace his family

How did the united states surprise other delegates at the washington naval conference in 1921

Which of these is not a criticism of the concentric zone model? it does not accurately describe cities after the rise of suburban development. it only applies to cities that grew after the development of the automobile. it assumes that inner-city areas will always be repurposed instead of abandoned. it places too much importance on the traditional central business district.