Why did the immegrents go mostly to the north in 1865-1900?

Between 1865 and 1900, many immigrants were drawn to the northern United States due to the region's rapidly industrializing economy, which created numerous job opportunities in factories and urban centers. The availability of jobs, coupled with the promise of better living conditions and more social mobility, attracted immigrants seeking to escape poverty and unrest in their home countries. Additionally, the north had established immigrant communities that provided support networks, making it easier for newcomers to settle and find work.