Where would you expect to find the most us factories at the turn of the century? why?

North

Explanation:

I would expect to find that most US factories at the turn of the century were located in the North. This is because the North was, even during the Antebellum period, more industrialized than the South, which relied mostly on agriculture. After the Civil War, this difference was even clearer, as the South struggled to recover economically. Finally, towards the end of the century, the North received a large influx of immigrants looking for work in the new factories, creating a boom in cities and industrial production in the region.

It was all foreign powers to have the same chance to trade with China.