The u.s. became a superpower around the turn of the twentieth century. this was because the u.s. was able to create a stepping stone to the commerce of

The U.S. became a superpower around the turn of the twentieth century. This was because the U.S. was able to create a stepping stone to the commerce of the Immigration Restriction League of the 1890s, Chinese Exclusion Act of 1882, as well as anti-Irish sentiments. Hope this helps.

The U.S. became a superpower around the turn of the twentieth century. This was because the U.S. was able to create a stepping stone to the commerce of 

Asia

Well back then the only way to delivery something was thru the railroad, so once that collasped, it meant that stuff would not get delivery, or take a lot longer to get it