The mississippi river was a key factor during the civil war because it was an important source of drinking water. it divided the south’s territory in half. it was the only route inland for the union navy. it was needed as a port for european troops.

The correct answer is

The Mississippi River was a key factor during the civil war because it divided the South's territory in half.

The mississippi River was the primary route for the Confederacy when bringing goods, commerce and transportation.

With the "Anaconda Plan" General Scott proposed a plan to get a blockade of southern ports and seized the mississippi River cutting the south in to two. By 1862 the efforts to seize the Mississippi River started and as planned the south was eventually divided, being the Union forces the ones winning the American Civil War.

The correct answer is, "it divided the South’s territory in half."

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the industrial development of cities in the ruhr area in the nineteenth century is described. the research was based on english and german language sources. several factors that shaped growth and paths of the cities were categorized and analyzed. they are locations, resources, traditions, entrepreneurs, and technological developments. locations and resources were the most important among them; other factors may be regarded as consequences from locations and resources. among the cities, bochum, essen, gelsenkirchen, and dortmund had the richest resources and most favorable locations in the transportation network and grew to be the largest cities in the ruhr area near the end of the nineteenth century. riverside location was also a favorable factor for the development, as shown in the development of duisburg on the confluence of rhine and ruhr. resource distribution can explain the rise of textile industry, metallurgical industry, and coal and iron industries, and the northward progression of the mining industry. tradition was an important factor for cities such as krefeld, barmen, elberfeld, solingen, and remscheid, which experienced development based on their traditions through the nineteenth century. various entrepreneurs exerted influences within and beyond the local level over the ruhr area. technological development stimulated the northward progression of the mining industry and the deep connection between the coal and the iron industries.

the name of the theory is landmass theory.