When did Detroit become popular for building cars?

Detroit's rise as a major center for automobile manufacturing wasn't a sudden event, but rather a gradual process that spanned several decades at the turn of the 20th century. However, the period from roughly the late 1890s to the early 1910s saw the city's transformation into the "Motor City." Several factors contributed, including readily available resources (like iron ore from the Upper Peninsula of Michigan), skilled labor, and entrepreneurial spirit. By the 1920s, Detroit's dominance in automobile production was firmly established.